- 5 hours ago
Adding another blanket on top may not solve a cold bed—the missing insulation could be underneath you. Elias Yoder explains how body weight compresses bedding, pushing out the still air that traps warmth, while a cold mattress or bed base draws heat from your back, hips, and legs. A simple check can help identify the problem, followed by practical fixes, starting with moving a blanket beneath the bottom sheet.
The advice also covers wool, slatted bed frames, cold floors, outside walls, and beds above unheated spaces, with low-cost options such as cardboard or a closed-cell foam mat. This practical home-comfort guide explores bed insulation, heat loss, and traditional bedding—useful for anyone seeking ways to stay warmer in a cold bedroom without simply piling on more blankets. Find cold-bed tips, winter bedding advice, and clear explanations of mattress insulation for everyday home improvement listening.
The advice also covers wool, slatted bed frames, cold floors, outside walls, and beds above unheated spaces, with low-cost options such as cardboard or a closed-cell foam mat. This practical home-comfort guide explores bed insulation, heat loss, and traditional bedding—useful for anyone seeking ways to stay warmer in a cold bedroom without simply piling on more blankets. Find cold-bed tips, winter bedding advice, and clear explanations of mattress insulation for everyday home improvement listening.
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LifestyleTranscript
00:00You are cold in bed, so you have put another blanket on top.
00:04And it has not worked.
00:06It never really works.
00:08You get warmer for 20 minutes, and then, at 3 in the morning,
00:12you are lying there again with a cold line down your back
00:15and a pile of bedding over you that is doing almost nothing.
00:20I know why.
00:21I have twice said something about it on this channel
00:24and then walked straight past it.
00:27Here is what I said.
00:28You compress the bedding you are lying on,
00:31and compressed feathers and wool hold no air and therefore hold no warmth.
00:37Both times I left it there.
00:40Today I want to go back to it,
00:42because that one sentence is the whole answer to a cold bed.
00:47I am Elias Yoder, and our bedrooms are not heated,
00:51not underheated, not heated at all.
00:54Everything that keeps you warm works the same way.
00:58It does not make heat.
01:00It holds still air, and still air is a poor conductor,
01:05so the warmth you make cannot get away from you.
01:08A blanket, a coat, a duvet, the wool on a sheep,
01:13all of them are a way of holding air in place.
01:16Now press any of them flat, and the air goes out,
01:20and when the air is gone, the insulation is gone with it.
01:24A compressed inch of down is not a weaker version of a loose inch of down.
01:30It is nothing at all.
01:32And you weigh what you weigh.
01:35Every single thing underneath your body is pressed flat all night long.
01:40My grandmother knew this, and never explained it once.
01:44When a child in this house said they were cold,
01:47she did not come up with another quilt for the top of the bed.
01:51She lifted the sheet, folded a wool blanket,
01:55laid it flat on the mattress, put the sheet back over it,
01:58and sent you up again.
02:00And you slept.
02:02You do not lose your heat to the air above you.
02:05You lose it to whatever you are lying on.
02:08I gathered the whole of it into a book at EliasYoder.com.
02:13The book is the long version.
02:15If you want it, it is there.
02:17I will not mention it again.
02:20And there is a second half to it that makes it worse,
02:23which is the way the heat leaves.
02:26Above you there is air, and air is slow.
02:30Underneath you there is a solid thing pressed hard against your whole back and your legs,
02:35and a solid thing in direct contact draws heat out of you far faster than air ever will.
02:43That is why a stone floor feels cold to a bare foot,
02:47while the air in the same room feels fine.
02:50The stone is not colder than the air.
02:54It is just much better at taking your heat.
02:57So you are lying on the fastest escape route in the room with no insulation on it at all,
03:04and you have been answering that by adding more insulation to the slow side.
03:09And there is a way to check whether this is your problem,
03:12which takes no equipment, and you can do it tonight.
03:16Lie in bed and pay attention to where you are actually cold.
03:20If your chest and shoulders are fine,
03:23and it is your back and your hips and the backs of your legs that are cold,
03:28that is the answer.
03:30Nothing is coming down on you from above.
03:32It is being drawn out of you from below,
03:35at the points where your weight is pressing hardest,
03:38and the bedding under you is squashed flattest.
03:42And in the morning, before you get up,
03:45put a hand flat on the mattress beside where you were lying.
03:48If that spot is properly cold after a whole night with a warm body 6 inches away,
03:55you have no insulation underneath you at all.
03:59That is the entire problem.
04:01Here is how to fix it, and most of it is free.
04:051. Put the blanket underneath.
04:08This is the whole video, and you can do it tonight for nothing.
04:12Take one of the blankets off the top of the bed,
04:15pull back the bottom sheet,
04:17lay the blanket flat on the mattress,
04:19and put the sheet back over it.
04:22One blanket moved from above to below
04:25will do more than two added on top.
04:28Wool is best because wool fibers are crimped and springy
04:32and fight being squashed,
04:34so even flattened, it keeps a little air in it.
04:38A folded quilt does nearly as well.
04:412. Practical Notes
04:43Lay it flat and smooth because a blanket that rucks up into ridges leaves cold lanes between them,
04:51and you will feel every one.
04:53And if all you have are thin blankets, fold one in two and use it that way rather than laying
04:59two separate ones,
05:00since a fold holds its loft better than a single layer under weight.
05:05If your bed has a fitted sheet, the blanket goes between the mattress and the fitted sheet,
05:11which will also stop it shifting about in the night.
05:14If you use a flat sheet, tuck the blanket in with it.
05:18Either way, that is the whole job, and it is the only thing on this list you need to do
05:23tonight.
05:252. Go and find out what is under you at the moment.
05:29Strip the bed back to the mattress and look.
05:32Most people have a sheet, and under that a mattress, and under that a hollow space.
05:37That is it.
05:38There is no insulation anywhere in that stack,
05:42and you have never once thought about it,
05:44because every shop in the country sells you things to put on top.
05:493. Look at what the bed is standing on, because this decides how cold the mattress gets.
05:55A slatted frame with open air underneath is the coldest,
05:59and in a cold room with any draft moving at floor level, it is cold all night.
06:04A solid platform base is warmer.
06:08A divan with drawers in it is warmer still,
06:11because the drawers and whatever is in them block the air.
06:14If you have a slatted bed in a cold room,
06:17that open space under you is not a neutral thing.
06:21It is a cold cellar four inches below your back.
06:25What to do about each one?
06:27If it is slats, you want something laid across them under the mattress.
06:32A sheet of cardboard, a thin board, an old blanket, anything that closes that gap off.
06:39If it is a solid platform, you are already better placed,
06:43and a blanket or a mat on top of it finishes the job.
06:46If it is a divan with drawers, fill the drawers, because full drawers block air, and empty ones do not.
06:55And whatever the base, do not store the cold things under your bed.
07:00Suitcases are fine. A box of tinned goods, or anything that has been in an unheated room,
07:05is a block of cold sitting directly under you until it slowly comes up to room temperature,
07:11and in a cold bedroom, it may never get there.
07:164. A mattress straight on the floor is the worst arrangement there is,
07:21and a great many people have ended up with one.
07:235. The floor is a large, cold, solid surface in direct contact with the only part of your bedding
07:31that cannot insulate you. If you have one, do not leave it there for winter. Anything that lifts it
07:38and puts air underneath will help, even a few lengths of batten.
07:435. Pull the bed away from an outside wall. Four inches is enough. A cold exterior wall does to your
07:51side exactly what the floor does to your back, and the gap lets room air sit between you and it.
07:59If the
07:59bed cannot move, hang a blanket or a rug on that wall behind it. That was what tapestries were for
08:06in cold
08:07houses long before anybody hung one up to look at, and a plain wool rug on the wall behind a
08:13headboard
08:14does exactly the same job today for very little money.
08:206. Newspaper or flattened cardboard under the mattress. This sounds like poverty,
08:26and it is simply physics. Both are full of trapped air, both cost nothing, and a layer of either between
08:33the mattress and the base makes a difference you can feel on the first night. People did this for
08:39generations, and they were not being quaint. 7. The best few dollars you can spend on a cold bed
08:47is a closed cell foam camping mat. Not an inflatable one, the plain blue roll. The reason campers sleep
08:55on those in the snow is exactly the reason you want one. Closed cell foam barely compresses,
09:02so unlike everything else in your bed, it goes on insulating with your whole weight on it. Lay it on
09:09the base under the mattress. A standard roll was about two feet wide, so you want two of them side
09:15by side for a double bed, and the pair will cost you less than a single cheap blanket. And here
09:22is the
09:23caution that goes with it, because that foam is also a vapor barrier. You give off a surprising amount of
09:29moisture in a night, and some of it goes down through the mattress, and if it reaches a cold sealed
09:35layer,
09:36it will condense there, and in time you get damp and mold underneath. So if you use foam, lift the
09:44mattress and let it breathe every couple of weeks, and look underneath while you are there. If that sounds
09:50like a job you will not do, use wool instead, which breathes, and accept slightly less insulation,
09:58for no risk at all. 8. Put a rug under the bed and beside it. Under the bed it blocks
10:06the cold floor
10:07and slows the air moving under there. Beside it, it means the first thing your feet touch in the morning
10:14is not a cold floor taking heat straight out of you, and that one matters more for how cold the
10:21room
10:21feels than anything it does for the thermometer. That is worth saying plainly because it runs through
10:28this whole subject. A great deal of what people call a cold room is really a handful of cold surfaces
10:36touching them in the places that notice. Bare feet on boards, a shoulder against a wall,
10:43a back on a flattened mattress. Fix the touching, and the same room at the same temperature feels like
10:50a different house. 9. Now the big one, and this is for a particular group of people who have never
10:58understood why their room is colder than the rest of the house. If your bedroom sits over a garage,
11:05an open porch, an unheated store, or a crawl space, that floor is not an interior floor. It is an
11:14exterior
11:15wall that you walk on, with winter air pressed up against the other side of it, and no amount of
11:22bedding
11:22will ever win that argument. If that is you, the fix is not in the bedroom at all. It is
11:29underneath,
11:30in the garage or the crawl space, insulating up between the joists from below. That is a proper
11:37job, and it is the single highest value thing you could do to that room, and it will cut your
11:43heating
11:44bill as well as warm your bed. Here is how to know whether that is what you are dealing with.
11:51Go into
11:51that bedroom on a cold morning and put your bare hand flat on the floor. Then go to a bedroom
11:58that is
11:59not over an unheated space, and do the same. If there is a plain difference you can feel through
12:05your palm, you have found it, and no amount of bedding was ever going to be the answer.
12:12And if you do go under there, two things while you are down. Look at the sill while you have
12:18the light
12:19out, since we have a whole video on what water does to it. And come out with a count of
12:25how many
12:26joist bays there actually are, because that is the number a man will ask you for when you phone about
12:33the job. 10. And the one to act on first if it applies in your house. Children and older people
12:42feel this before anybody else does. A small body makes less heat and loses it faster, and an older
12:50body does not always notice it is getting cold, which is the dangerous part. So if there is a child
12:57or an elderly person in a cold room, do their bed before you do your own. And a plain safety
13:05line on
13:05that. None of this applies to a baby. An infant's cot takes a firm, flat mattress and nothing else. No
13:15loose
13:15blanket, no padding, no foam, nothing underneath or around them. That is not me being careful. That is
13:24the one rule in this whole subject that is not negotiable. I will also say that if somebody in your
13:32house is old or unwell, a cold bedroom is not simply a matter of comfort, and warming the bed is
13:40not a
13:40substitute for warming the person. Warm the bed and keep the room reasonable as well. For hot water
13:48bottles and what to fill them with, we have been through that properly in two other videos, and I will
13:55not repeat it here, except to say that a bottle warms a bed for an hour or two, and a
14:01blanket underneath
14:02warms it every night for thirty years. Now, why has nobody told you any of this? Go into any shop
14:12that
14:12sells bedding and look at what is for sale. Duvets by the dozen in four warmths. Throws, quilts, blankets,
14:22toppers that promise softness. Every one of them is a thing to put on top of you, and the entire
14:28trade
14:29is arranged that way, because that is what people ask for when they are cold, and nobody gets rich
14:36telling you to move a blanket you already own from one side of your body to the other. And nobody
14:43is
14:43lying to you. A duvet works. It is simply working on the slow half of the problem, while the fast
14:51half
14:51goes completely unattended, and the shop has no reason in the world to mention it. Look at how the
14:58thing is even measured. Bedding is sold by a warmth rating, and every one of those ratings describes a
15:05thing to put over you. There is no number on anything for what goes underneath, because almost
15:12nothing is sold to go underneath, because nobody is asking for it, because nobody has told them. That
15:20loop has been going round for about seventy years. That is worse than a conspiracy, because a conspiracy
15:27can be exposed. This is just a whole industry pointed at one side of a bed. And here is what
15:34I find
15:35remarkable about it. Go and look at how beds used to be made, before any of us were born. They
15:42stood high
15:42up off the floor, on legs. Underneath the mattress, there was a lattice of rope that you tightened with a
15:50key, with air all through it. On top of the rope went a tick, stuffed loose with straw or husks
15:57or feathers,
15:58and the whole of it was one deep layer of trapped air under the sleeper. Nobody built that because they
16:06had read anything about conduction. They built it because beds that were low and solid were cold, and
16:13beds that were high and loose were warm. And over a few hundred years, everybody who made beds arrived
16:21at the same answer. And the proof that they understood it is in the language. We still say,
16:27we sleep tight, and that is the rope, because a rope bed that had gone slack sagged and let the
16:35tick
16:35bunch up and the sleeper down onto the frame, and you tightened it with a key before a cold night.
16:42It is a saying about insulation, and almost nobody alive knows that is what they are saying. I find
16:50that worth sitting with. The knowledge did not get disproved. It got made unnecessary by a furnace,
16:57and then the words outlived the understanding by about three generations, which is roughly how long
17:04it takes for a thing everybody knew to become a thing nobody knows. Then we got central heating,
17:10and for about seventy years none of it mattered, and the beds got lower and more solid, and nobody
17:17noticed because the room itself was warm. Now people are turning the heat down again to save money,
17:24and discovering that a modern bed in a cold room is a genuinely cold place to lie, and they have
17:31no idea
17:32why, because the reason was quietly engineered out while nobody was watching. You do not lose your
17:39heat to the air above you. You lose it to whatever you are lying on. So tonight, before bed, take
17:47one
17:48blanket off the top and put it underneath the bottom sheet. That is it. That is the whole experiment,
17:55and it costs you nothing and takes four minutes, and you will know by morning whether I am right.
18:01Then come down to the comments and tell me, because I would like to know how many of you feel
18:07it on the
18:08first night. And tell me what your bed stands on while you are there. Slats, or a solid base, or
18:15drawers,
18:16or the floor itself, because I suspect the people who feel the biggest difference will all have the
18:22same answer. Next time I want to go through the first hour of a power cut in order, because there
18:29are two or three things worth doing in the first sixty minutes that almost nobody thinks of until it is
18:35too late to do them. Thank you for sitting with me. Move the blanket tonight. The people who built this
18:42country with their hands knew that, and we are only just starting to remember it.