When I speak to the people around me, so many are feeling it. The pressure to be in full bloom. To pack everything into these few precious months.
The thinking about holidays. The end of term. The social commitments that stack up before you've had a chance to think. Summer looks like ease from the outside but rarely feels like it from the inside.
Our OnePoll survey of 1,000 UK adults tells the story:
Almost half of us lose up to two hours of sleep a night at this time of year. 89% blame the heat. 55% can't stay asleep once the light arrives. 1 in 5 are dealing with allergies on top of both.
Night after night. For months.
The problem isn't you. It's your bedroom.
Despite our love of all things summer, it's one of the worst seasons for sleep. Most people don't realise it until August comes around and everything feels flat and hard and further away than it should.
Our own customer survey of over 420 people tells the same story. Only 22% said they get enough sleep most nights. 80% sleep poorly or inconsistently. 58% point to temperature as a key disruptor.
This is not a willpower problem. It's a physics problem.
What's actually destroying our sleep
Your body needs to drop its core temperature by about 1 degree Celsius to fall asleep and stay asleep. It's not a preference; t's a physiological requirement.
As Professor Matthew Walker writes in Why We Sleep:
"Thermal environment is perhaps the most under-appreciated factor determining the ease with which you will fall asleep tonight. Ambient room temperature, bedding, and nightclothes dictate the thermal envelope that wraps around your body at night."
He identifies 18°C as optimal for most people.
British bedrooms in summer regularly blow past that. Our housing stock was built to retain heat, not release it. A 2025 University of East London study found that 80% of UK households now experience summer overheating, with over half reporting sleep disruption as a direct result.
Then there's light. British summer dawns arrive before 5am. Light suppresses melatonin, the hormone that initiates sleep. So your bedroom is too warm to trigger the core temperature drop you need, and the light outside is suppressing the very hormone that helps is.
For the 33% of our survey respondents navigating menopause or perimenopause, this compounds dramatically. More than 80% of women experience night sweats or hot flushes during this transition. In summer, these collide with already-elevated bedroom temperatures and bedding that traps moisture rather than moving it.
We're not failing at sleep. Our environment is failing us.
Humidity is the real problem.
Your body loses moisture all night through breath and skin. Under synthetic bedding, it has nowhere to go. It builds up around your body, raises your perceived temperature, and wakes you up. The duvet isn't too warm. It's creating a humid microclimate.
54% of our survey respondents experience night sweats or overheating. Nearly all of them are sleeping under materials that make this worse. And for the one in five people whose sleep is disrupted by summer allergies, synthetic bedding compounds the problem further. Dust mites thrive in warm, humid conditions. Synthetic fill creates exactly that environment, every night.
"I wake up in the night, boiling hot. Duvet on, duvet off. It's exhausting."
Why wool works
In January 2026, British Wool, in partnership with Bangor University's BioComposites Centre and the International Wool Textile Organisation, published the most rigorous independent study of duvet materials to date.
The findings were decisive. At elevated temperatures simulating perspiration, wool transmitted up to 139% more moisture than synthetic duvets, and moved it up to 120% faster. During testing, condensation actually formed inside the synthetic duvet and dripped back into the test bath. That's what polyester does at body temperature, every night. It doesn't move moisture. It traps it until it becomes liquid.
Wool does the opposite. Its fibres are hygroscopic, absorbing moisture vapour before it condenses against the skin, then releasing it gradually. You're not just cooler. You're actually drier.
The sleep ecosystem
Sleep happens in an environment and every layer either supports your body's thermoregulation or fights it.
The fill layer: wool duvets and pillows. The core thermoregulatory layer. A wool duvet responds to your body's heat output in real time. A wool pillow matters too. Your head releases a disproportionate amount of heat during sleep, and a synthetic pillow traps it.
The contact layer: Hemp and organic cotton bed linen. What touches your skin is the first line of defence. Hemp is extremely breathable, naturally antibacterial, and one of the lowest-impact fibres in textile production.
The foundation layer: wool mattress topper. 51% of our respondents are sleeping on a mattress five or more years old. A wool topper immediately improves breathability and support without replacing the whole mattress. It's often the highest-impact single change you can make.
The reframe.
47% of our respondents said price is the main barrier to upgrading their bedding. That's real. But something is shifting.
As Sophie, founder of Floks says:
"When you reframe sleep as a wellbeing investment over time, even the cost of a mattress works out at pennies per night over the time you have it. I was a terrible sleeper until I started questioning what I was sleeping on and under, and that led me to create Floks."
A good wool duvet lasts decades. The nightly cost, amortised over its life, is trivial. The nightly benefit is not.
73% of our respondents want bedding designed for their specific sleep needs. 79% have tried wool and loved it, or actively want to. The demand is there. The materials exist.
"I would love to wake up feeling truly rested. Not just less tired."
This is why Floks exists.
Shop our summer sleep collection
Floks OnePoll survey commissioned July 2023, 1,000 UK adults aged 30 to 55. Floks Sleep Survey 2025, 420+ respondents.
Image credit: Unsplash
