Summer nights can turn even the soundest sleeper restless, and a lot of that comes down to what you're wearing to bed. The heat makes lightweight, breathable fabrics like linen, silk, or cotton essential, since anything synthetic traps warmth against your skin instead of letting it escape.
This guide walks through which fabrics and styles of men's and women's pyjamas keep you coolest through a heatwave, and why a thin layer usually beats sleeping with nothing on at all.
Heat Disrupts Your Sleep
Your body lowers its core temperature to fall asleep, and a hot bedroom blocks that natural drop. Most sleep-health guidance points to a bedroom temperature of around 16–18°C as the sweet spot for rest, so a room that sits well above that keeps your system working against you all night.
The fabric touching your skin plays a direct role. When sweat has nowhere to go, it pools against your body, and clingy synthetic materials make it worse by trapping both heat and damp. That combination is what leaves you tossing, kicking off the duvet and waking at 3am feeling sticky.
Getting your sleepwear right is one of the simplest changes you can make, which is why we give fabric and fit the attention they deserve next.
What to Wear to Bed When It's Hot
Reach for lightweight natural fibres in loose, breathable cuts. Linen, silk, and cotton all outperform synthetics because they let air circulate and pull moisture off your skin, whereas polyester holds heat and clings once you start to sweat.
A relaxed fit matters as much as the fabric, since fitted styles seal warmth in, and swapping tight-fitting pyjama sets for something from our loungewear range makes it easier to stay loose and cool. A thin layer usually beats sleeping with nothing on, because it wicks away sweat rather than leaving it to sit on your skin.
The Best Fabrics for Hot Nights
The best fabric to wear to bed in summer is a natural fibre that breathes and absorbs. Here is how the three strongest options compare when the temperature climbs.
Linen
Linen is our pick for the hottest, stickiest nights. Its loose weave allows constant airflow, it absorbs a good deal of moisture before feeling damp, and it dries quickly so you do not stay wet for long. It also gets softer with every wash. If you run hot, our linen pyjamas are the most forgiving choice in a heatwave.
Silk
Silk regulates temperature well and feels smooth and cool against the skin, which makes it a strong option for anyone with sensitive or reactive skin that reacts to rougher weaves. It wicks moisture and never clings the way synthetics do. Our silk pyjamas suit warm nights that are not quite at heatwave extremes, and they double as a treat you will want to wear year round.
Cotton
Cotton pyjamas are soft, breathable and widely loved, but it does hold moisture once it becomes damp, so they can feel heavy by morning on the very warmest nights. Choose a lightweight weave rather than a dense jersey to keep it airy. Research on sleepwear consistently rates cotton and linen among the most breathable fabrics, as this sleep survey highlights.
What to avoid
Not every fabric works in your favour on a hot night. Polyester pyjamas, nylon, and other synthetics trap heat and moisture against your skin, so they work against you rather than helping you cool down.
Styles That Keep You Cool
The cut of your pyjamas should be considered as well as the fabric. Loose, open shapes let heat escape, while anything close-fitting keeps it locked in.
For maximum airflow on humid British nights, our shorty pyjama sets are hard to beat, as they leave your arms and legs free to release heat. A loose short-sleeve top or a camisole beats a fitted long-sleeve style, and a lightweight robe or a floaty nightdress gives you airy, unrestricted coverage when you want a little more.
Loose pyjamas usually beat sleeping with nothing on when it's hot. A thin natural layer wicks sweat away from your skin, keeps you comfortable if you throw off the duvet, and is more hygienic than sleeping bare against your bedding. The trick is to keep necklines open and reach for something like a nightshirt with a relaxed cut, rather than anything skin-tight.
Other Tips for Sleeping Through a Heatwave
Sleepwear is one piece of the puzzle. To keep cool in bed during a heatwave, change the room around you too.
- Swap to cotton or linen bedding and a lighter tog duvet.
- Keep curtains closed during the day to block the sun, then cool the room before bed.
- Take a cool shower before bed and position a fan for a cross-breeze.
- Keep a glass of water on the bedside table and stay hydrated.
- Use cotton or linen pillowcases to keep your head and neck cool.
Summer Sleepwear FAQs
What is the best material to wear to bed in hot weather?
Linen for the hottest nights, thanks to its airflow and fast drying, with silk and lightweight cotton close behind. All three breathe far better than synthetics.
Is it better to sleep in loose pyjamas or nothing at all in summer?
Loose pyjamas in a natural fibre, because they wick sweat off your skin and keep you comfortable and hygienic through the night.
What is the healthiest thing to wear to bed?
Clean, loose sleepwear in breathable natural fibres that let your skin regulate its temperature and manage moisture.
Should you wear underwear to bed in summer?
It is a personal choice. If you do, choose breathable cotton over synthetics to help your skin stay dry and cool.
Sleep Cooler Tonight: Summer Sleepwear That Works
You now have everything you need to build a cooler night's sleep, from the right fabric to the right cut. Pick a lightweight set that suits how you sleep, and stay comfortable through the next warm spell. Browse our full pyjamas range to find your fit, and read more about the best pyjamas for hot sleepers here.
