The Temperature Nobody Talks About

Light gets all the attention. Temperature is the other half of the story and almost nobody adjusts it deliberately.

Sleep begins with a drop

Your core body temperature follows a daily rhythm — it peaks in the early evening and falls through the night, reaching its lowest point a couple of hours before you wake.

That fall isn't a consequence of sleeping. It's part of how sleep starts. Your body actively sheds heat, mostly through the hands and feet, in the period before you drop off.

A warm room interferes with that. Not dramatically — you'll still sleep — but it takes longer to get there and the night is lighter than it would have been.

Which is why the room should feel slightly unwelcoming

The rule of thumb we use: if the bedroom feels pleasant when you walk in, it's probably too warm for sleeping in.

It should feel a touch cool when you get into bed, with the warmth coming from what's on top of you rather than from the air. That combination — cold room, warm bed — is what most people are unknowingly paying for when they sleep well in a hotel.

The hot shower thing

A warm shower or bath in the hour before bed is one of the more counter-intuitive tricks, and it works for a reason that isn't relaxation.

Warming the skin brings blood to the surface. When you step out, that heat is dumped into the room and your core temperature drops faster than it otherwise would — you feel warm while your body actively cools. It's the closest thing to a physical trigger we've found.

Warm yourself to cool down. It sounds wrong and it is the whole mechanism.

Feet, specifically

Cold feet are a common reason for lying awake, and the fix is counter-intuitive too: warming your feet helps you lose heat overall, because the blood vessels there are one of the main routes your body uses to shed it.

So: cool room, warm feet. Socks are not a failure of nerve.

What we actually do

Window open most of the year, including in winter for at least part of the evening. Heating off in the bedroom overnight. Weight rather than warmth on the bed — which is a big part of why a heavy blanket works in summer as well as winter.

Nothing here costs anything. It's the cheapest change on this website after turning off a light.