There's a particular kind of misery that arrives around two in the morning in late June: lying on top of the duvet, flipping the pillow for the cool side that no longer exists, listening to a fan push warm air around the room. Britain isn't built for this. Our houses are designed to trap heat, which is wonderful in February and cruel in a July night that won't drop below 22 degrees. The good news is that most of what actually helps costs little or nothing — and a fair amount of the advice floating around does nothing at all.
Cool the room before you cool yourself
The mistake people make is treating the body and the room as the same problem. They're not. A bedroom that's been baking behind a sunny window all day is radiating heat back at you from the walls long after the sun's gone, so the single most effective thing is to stop that heat getting in. Close the curtains or, better, the external shutters on the sunny side first thing in the morning, before the room warms up. Blackout blinds aren't just for light; a pale, lined curtain can knock a few degrees off a south-facing room by late afternoon.
Then there's the fan, which almost everyone uses wrongly. A fan doesn't cool air — it moves it, and moving air helps you only by speeding up the evaporation of sweat from your skin. Point it at yourself, not at the room in general. The old trick of putting a bowl of ice in front of the fan does a little, briefly, but you'll get far more from cross-ventilation: open a window on one side of the home and another on the opposite side once the outside air finally drops below the indoor temperature, usually well after midnight.
The body, after the room
Your core temperature has to fall by about a degree for sleep to come, and you can nudge it down deliberately. A lukewarm shower before bed works better than a cold one, oddly — a freezing shower makes your body clamp down and conserve heat, while a tepid one lets warmth radiate away afterwards. Run cold water over your wrists, or press a cool flannel to the back of your neck, where blood vessels sit close to the surface.
Skip the bedclothes you'd normally reach for. A single cotton or linen sheet beats any "cooling" duvet sold for £80, whatever the packaging promises.
Linen and cotton let sweat evaporate; polyester traps it against you. The same goes for what you wear, if anything — loose natural fibres or nothing at all. One genuinely useful trick borrowed from hot countries is the so-called Egyptian method: dampen a sheet or a thin towel, wring it out so it's not dripping, and lie under it. As the water evaporates it pulls heat off you. It feels strange the first time and works surprisingly well.
What to ignore
- "Cooling" pillows and gel pads feel pleasant for the ten minutes before your body heat saturates them, then they're just a warm pillow.
- Sticking your sheets in the freezer in a bag — lovely for the first three minutes, pointless thereafter.
- A big glass of ice water at bedtime: hydrate through the evening instead, or you'll be up at 4am for the bathroom, which wrecks sleep more thoroughly than the heat does.
A small caveat worth saying plainly: heat is not just uncomfortable, it's a health risk for some. If you're caring for an older relative, a baby, or anyone with a heart condition, a hot bedroom is a genuine concern rather than a nuisance, and on the worst nights it's worth moving them to the coolest room in the house, even if that means a sofa downstairs.
If you can spend a little
A decent tower fan from Argos or John Lewis runs from around £40 and is quieter than the cheap clip-on sort, which matters when it has to run all night. A portable air conditioner is the only thing that genuinely lowers room temperature rather than just moving air, but they're noisy, thirsty for electricity, and need a window kit for the exhaust hose — worth it only if you're losing sleep for weeks, not the odd sticky night.
The honest version of all this: on a 30-degree night you won't sleep like it's autumn. But a closed curtain at dawn, a damp sheet, and a fan aimed at your skin will get you most of the way there, for the price of nothing.