What people actually say about sleeping.

Why does my arm go numb when I sleep on my side?

Sleep Lab · Support & sleep position · 5 min read

It usually isn't the arm — it's the shoulder. On a normal pillow the shoulder gets pushed up and bent, the arm carries weight all night, and circulation drops until the hand goes quiet. Change the shoulder's position and the numbness usually changes with it.

What pillow height do side sleepers actually need?

Sleep Lab · Support & sleep position · 4 min read

Follow shoulder width, not body height. The right loft holds your neck level with your spine; too low lets the head drop toward the mattress, too high pushes it up toward the ceiling.

Why do I wake up with neck pain on one side only?

Sleep Lab · Support & sleep position · 5 min read

If only one side hurts, look at the day before you sense the night. Most one-sided neck pain has two inputs: an asymmetric pillow shape and an asymmetric daytime load.

Why does every sleep mask leak light at the nose?

Sleep Lab · Eye & light · 4 min read

Because the nose is the only thing that keeps your face off the surface. A flat piece of fabric has to bend round it, and every bend opens a gap. Shaped cups move the fabric off the nose instead of over it.

Why am I awake at 3am every night?

Sleep Lab · Habits & environment · 5 min read

Something in the room changes at three, and your sleep is light enough to notice it. Temperature is dropping, the house is at its quietest, and any fluctuation in light or sound arrives into that silence with nothing to mask it.

Does a butterfly pillow work for back sleepers?

Sleep Lab · Support & sleep position · 5 min read

Yes — but you are buying the middle of it, not the wings. A butterfly shape is a way of carrying two heights in one piece of foam, and back sleeping uses the lower one.

Is it safe to sleep with earbuds in?

Sleep Lab · Sound & sleep · 5 min read

There is no official verdict on sleeping in earbuds, so the honest answer is a set of trade-offs rather than a yes. Three of them are physical, and you can check each one tonight without buying anything.

Eye strain before bed: a 10-minute wind-down

Sleep Lab · Eye & light · 5 min read

By the last ten minutes of the day your eyes have been held on one near, bright surface for hours. A wind-down is not something you add to them. It is the part where you stop asking them to focus at all.

My weighted blanket is too hot. Now what?

Sleep Lab · Habits & environment · 5 min read

A weighted blanket gets hot for a plain physical reason: it is one dense layer that lets almost no air through, usually with another layer on top of it. The fix is not something you add to the room. It is one layer you take away.

How long does a memory foam pillow actually last?

Sleep Lab · Support & sleep position · 5 min read

A foam pillow does not expire on a date. It stops doing its job when the shape stops coming back — and that is something you can check tonight with one hand, not something a calendar can tell you.

White noise, brown noise, or just a fan?

Sleep Lab · Sound & sleep · 5 min read

The choice is not about which colour of noise works best. It is about which sound your room is missing — and whether you are trying to cover a sudden noise or a constant one.

Do earplugs really block a snoring partner?

Sleep Lab · Sound & sleep · 5 min read

Most people ask this after a few bad nights, not out of curiosity. The honest answer has two parts: what a plug can change, and what it will also take away.

Red light or amber light for the bedroom?

Sleep Lab · Light & sleep · 5 min read

Red and amber are usually presented as a competition. In a bedroom the more useful question is far less interesting: can you forget the light is on?

Why does my neck feel fine on weekends?

Sleep Lab · Habits & environment · 5 min read

The question sounds like a joke about Mondays, but it is a real diagnostic. The pillow is the same object on both days — so whatever feels different by Sunday morning was built somewhere else.

Cold feet keep waking me up. What actually helps?

Sleep Lab · Habits & environment · 5 min read

Cold feet wake people in a particular way: you fall asleep warm and are woken cold, hours later, by something that ran out, slipped off, or never reached the end of the bed.

How do I wash a memory foam pillow without ruining it?

Sleep Lab · Bedding & materials · 4 min read

You wash the cover and you air the core. Memory foam is not ruined by use — it is ruined by water, and the two halves of a pillow are cleaned in two completely different ways.

Why do small sounds wake me up and not my partner?

Sleep Lab · Sound & sleep · 4 min read

Two people in one bed hear the same room. The difference is usually not who is a lighter sleeper — it is which ear is nearer the noise, and whether the room had anything steady for a small sound to hide behind.

Scrolling in bed: why it costs more than the minutes

Sleep Lab · Habits & environment · 5 min read

The cost of scrolling in bed is usually counted in minutes. The minutes are the smallest part of it. The rest is what the phone leaves behind when you finally put it down.

Why do I wake up when the room is still dark?

Sleep Lab · Light & sleep · 5 min read

It is dark, nothing woke you that you can name, and you are awake anyway. The dark rules out one cause of waking. It does not rule out the others.

Is my shoulder pain the pillow or the mattress?

Sleep Lab · Support & sleep position · 5 min read

The question usually arrives out of frustration, because both objects were bought around the same time and neither came with a way to test it. The useful part is that the two do different jobs, and a week of changing one at a time usually names the one worth changing.

Shoulders tight from desk work: the 5-minute evening release

Sleep Lab · Habits & environment · 5 min read

Tightness built over ten hours at a desk does not leave because the working day did. What usually helps is a short, boring, repeatable sequence in the evening — not a dramatic stretch that earns its name by hurting.

A 20-minute bedtime routine that people actually keep

Sleep Lab · Habits & environment · 5 min read

Most bedtime routines are written like a prescription and kept like a resolution: several steps, an exact order, and a decision to make at the hour you have the least judgement left. The version that survives is shorter, and it hangs on one thing that already happens rather than on a clock.

My star projector keeps me awake — what am I doing wrong?

Sleep Lab · Light & sleep · 5 min read

The picture is almost never the reason. A projector changes a dark room in three ways at once — it adds light, it puts something moving above the bed, and it runs a small motor — and any one of those can keep a light sleeper awake long after the stars have stopped being interesting.

Dry eyes at bedtime: screens, heat, and what actually helps

Sleep Lab · Eye & light · 5 min read

Three things sit in a bedroom at ten in the evening and none of them are in your eyes: a screen held at the same short distance for two hours, air that the heating has been pulling water out of since the afternoon, and a fan or a vent moving across your face. Changing them is unglamorous, and it is also the only part you control.

Can I use a pillow speaker without waking my partner?

Sleep Lab · Sound & sleep · 5 min read

Mostly yes, with one condition that decides everything else: the pillow has to be the thing standing between the speaker and the room. A speaker under a pillow is quiet to the rest of the room because the pillow absorbs what would have crossed it, and audible to you because your head is on the same pillow. Break that geometry and the trick stops working.

What is the best bedroom temperature for sleep?

Sleep Lab · Habits & environment · 6 min read

Every page on this subject hands you a number, and almost none of them arrive with the study that produced it. Here is the one bedroom figure we could put a source on, why it does not transfer to your room, and the order in which to change things when the room is the problem.

Falling asleep on the sofa first — is it helping or hurting?

Sleep Lab · Habits & environment · 6 min read

Falling asleep on the sofa and moving to bed later is not one night with a delay in it. It is two sleeps in two rooms, and only one of them was built for sleeping. Whether that helps depends on what happens in the twenty minutes between them.

Does lavender actually do anything for sleep?

Sleep Lab · Habits & environment · 7 min read

Lavender is sold with more certainty than any study gives it. The strongest evidence available is a pooled average across small trials, and an average is not a forecast. What you can test is narrower: whether the smell changes the hour, not whether it changes you.

Can a white noise machine do a custom sound mix?

Sleep Lab · Sound & sleep · 5 min read

Most sleep sound machines hand you a finished preset and call it a night. A custom sound mix is the other design: eight sounds with eight independent volume sliders, so you tune the room once instead of settling for a menu.

Does blue light before bed actually matter?

Sleep Lab · Eye & light · 5 min read

The honest answer is less dramatic than the one you have heard. The strongest thing we can point to is not the colour of the light at all — it is what the screen keeps you doing after you meant to stop.

Mind racing at bedtime — how do people settle it?

Sleep Lab · Habits & environment · 5 min read

A racing mind is usually not a mind with too much in it. It is a mind holding things that have not been told they can wait until morning.

A pillow for side sleepers with a stiff neck

Sleep Lab · Bedding & materials · 8 min read

If you wake up with a stiff neck and you sleep on your side, the pillow is usually the reason — and it is the height, not the softness. Here is how to measure the gap you are trying to fill, and what to do if you already bought the wrong pillow.

How to wind down after work when you cannot switch off

Sleep Lab · Habits & environment · 7 min read

There is a specific kind of tired where you have been at a screen since eight in the morning, your shoulders are up around your ears, and yet the moment you lie down your brain starts running the to-do list. The useful question is not how to fall asleep faster. It is what you are doing in the ten minutes before you get into bed.