Being too hot in bed is the number one cause of disrupted sleep in the UK. 37% of people cite overheating as their main sleep disruptor, according to the Dreams 2024 survey. Your duvet is the single biggest factor in how hot you get at night, and most people are sleeping under the wrong tog for their body temperature. This guide covers the best duvet for hot sleepers, from tog ratings to fill materials.
Tog ratings explained
Tog measures thermal resistance, meaning how well the duvet traps heat. Higher tog = more heat retained.
| Tog | Season | Best for |
|---|---|---|
| 1-4.5 | Summer | Hot sleepers, warm bedrooms, heatwaves |
| 7-7.5 | Spring/autumn | Most people in mild weather |
| 10.5 | Winter | Average sleepers in a normal bedroom (16-18°C) |
| 13.5-15 | Deep winter | Cold sleepers, unheated bedrooms |
If you consistently overheat, drop down a tog level from what feels intuitive. A hot sleeper in winter might be fine at 7.5 tog while everyone else needs 10.5. In summer, a 4.5 tog or even just a flat sheet might be right.
All-season duvets (two layers you poppper together) let you adjust: one thin layer for summer, both for winter. Practical but the combined version is often thicker than a dedicated winter duvet.
Best duvet for hot sleepers: fill types compared
Bamboo
Naturally temperature-regulating. Bamboo fibres wick moisture away from your body and allow air to circulate through the fill. Feels cool to the touch. Hypoallergenic. More breathable than polyester or microfibre. Our bamboo bedding guide covers the full bamboo range.
Bamboo is probably the best all-round fill for hot sleepers who don't want to think about it too much. It regulates temperature in both directions: cooler when you're hot, warmer when the temperature drops.
Wool
Wool is the original temperature regulator. It wicks moisture (up to 30% of its own weight before feeling damp) and breathes better than any synthetic fill. British wool duvets are widely available. They sleep cooler than synthetic fills in summer and warmer in winter.
Heavier than synthetic alternatives. Can't be machine washed at home (most need dry cleaning or professional laundering). More expensive than polyester.
Cotton
Cotton fill is breathable and washable. It sleeps cooler than polyester but not as cool as bamboo or wool. Tends to be thinner and flatter than foam or synthetic fills. Works well in low-tog summer duvets.
Silk
Silk fill is breathable, temperature-regulating, and extremely lightweight. Feels luxurious. The lightest option per tog rating. Expensive. Not as widely available as other fills.
Polyester/microfibre
The cheapest and most common duvet fill. Traps heat. Poor moisture wicking. If you're a hot sleeper and you're currently under a polyester duvet, switching the fill alone will make a noticeable difference. Even dropping the tog while staying with polyester helps, but switching material does more.
Down
Excellent warmth-to-weight ratio. Breathable for a warm fill, but still warmer than bamboo or wool at the same tog. Down is a better choice for cold sleepers than hot sleepers. If you love down but overheat, go for a much lower tog than you think you need.
What to spend
| Price range | What you get |
|---|---|
| Under £25 | Polyester/microfibre. Basic but does the job in a lower tog. |
| £25-50 | Bamboo or cotton fill. Best value for hot sleepers. |
| £50-80 | Quality bamboo, wool, or cotton. Better construction, more durable. |
| £80-150 | Premium wool or silk fill. Long-lasting, excellent temperature regulation. |
| £150+ | Hungarian goose down, premium silk. Diminishing returns for hot sleepers. |
For hot sleepers on a budget: a £30-40 bamboo-fill duvet in 4.5 tog will transform your sleep in summer. That's the single best-value change you can make.
The mattress and pillow connection
Your duvet is one layer of the heat equation. Your mattress retains heat (memory foam is the worst). Your pillow traps head heat. A cooling mattress topper addresses the mattress problem. A cooling pillow addresses the head. Swap all three and a hot bedroom becomes manageable.
For the wider bedroom cooling picture, our guide on cooling your bedroom without AC covers fans, ventilation, and window tricks.
Duvet covers matter too
A breathable duvet inside a polyester cover is like wearing a waterproof jacket over a cotton t-shirt. The outer layer traps the heat.
Cotton percale (crisp, cool, breathable), linen (textured, naturally cool), and bamboo covers all let air through. Polyester, satin-polyester blends, and brushed microfibre trap heat. The cover is cheaper to replace than the duvet, so if you're on a tight budget, start there.
Our bamboo bedding guide covers bamboo duvet covers specifically.
FAQ
What tog duvet is best for someone who overheats? 4.5 tog in summer, 7.5 tog in winter. If you're still hot at 7.5, drop to 4.5 year-round and wear warmer pyjamas when it's cold. Better to add layers you can remove than to be stuck under a heavy duvet.
Is bamboo or cotton better for hot sleepers? Bamboo. It's more breathable, wicks moisture faster, and feels cooler to the touch. Cotton is good but bamboo is specifically temperature-regulating.
Should hot sleepers avoid memory foam mattresses? Memory foam retains more heat than spring mattresses. If you're a hot sleeper on memory foam, a cooling topper and breathable bedding become more important, not less.
Can you wash a bamboo duvet? Most bamboo duvets can be machine washed at 40°C on a gentle cycle. Check the label. They dry faster than wool or down.
Is a higher thread count cooler? Not necessarily. Thread count measures density, not breathability. A tightly woven 400-thread-count sateen will feel warmer than a 200-thread-count cotton percale because the weave is denser and traps more air. For cooling, look at weave type (percale is coolest) rather than thread count.
