The light is doing something strange to you right now, and it is not your imagination. In the days around the June solstice, the longest stretch of daylight all year, the sky in most of the UK and the northern US stays bright well past nine in the evening. Your phone says it is bedtime. The window says it is still afternoon. Somewhere in that mismatch, a lot of women lose an hour or two of sleep without quite noticing how it happened.
This is not a willpower problem and it is not a sign that something is wrong with you. Your sleep is governed by an internal clock that takes most of its cues from light, and that clock is currently being told, very loudly, that the day is far from over. When the evenings stretch this long, melatonin (the hormone that makes you feel drowsy) gets released later than your alarm clock would like. You end up lying in a too-warm bedroom at 11pm feeling wired, replaying the day, wondering why you cannot switch off. Then the same long light wakes you before five, and the cycle compounds.
Why summer sleep feels harder, not easier
There is a quiet cultural lie that summer is the easy season. Brighter mornings, holidays, lighter clothes, more energy. For plenty of women the opposite is true, and the gap between how you are supposed to feel and how you actually feel becomes its own low hum of guilt. You are tired in the season everyone calls restful, and that feels like a personal failing rather than basic biology.
Three things tend to stack up at once. The late light pushes your body clock back, so you fall asleep later. The early light pulls your wake time forward, so you sleep less overall. And the warmth of a June night, especially in a flat that traps heat, makes the deep, restorative stages of sleep shallower and more broken. None of these is dramatic on its own. Together they can shave an hour off your real rest most nights for weeks, and chronic short sleep is one of the most reliable triggers for low mood, irritability and that thin-skinned, everything-is-too-much feeling.
Women carry an extra layer here that rarely gets mentioned. Sleep is more easily disrupted across the menstrual cycle, particularly in the days before a period, and again during the perimenopausal years when night sweats arrive uninvited. Add a hot June night to a body already running warm, and the longest day of the year can feel like the cruellest. If you have noticed your sleep falling apart specifically in midsummer, you are not being precious. You are responding to real physiology.
The thing nobody tells you about blackout curtains
Block the light. That is the single highest-leverage change, and most people under-do it.
A thin curtain that "mostly" darkens the room is not enough when the sun is up for sixteen hours. Your eyes detect light through closed lids, and even a sliver around the edge of a blind can nudge your clock. Proper blackout lining, or a well-fitted blackout blind that sits inside the window recess rather than over it, makes a genuine difference. If a full refit is not realistic this month, a sleep mask that actually contours to your nose costs under £15 and does most of the same job. The cheap flat ones that let light leak in at the bottom are close to useless, so spend the extra few pounds on a moulded one.
Morning light, by contrast, is your friend, and this is where it gets counterintuitive. The instinct in summer is to hide from the early sun so you can sleep longer. But getting bright light into your eyes soon after you wake, ideally outdoors for ten minutes with no sunglasses, actually helps anchor your clock earlier and makes the following evening's wind-down come on time. The light you want to fight is the late evening sort. The light you want to chase is the morning sort. Most of us have that exactly backwards.
Cooling the room matters more than the mattress
Your core temperature has to drop by about one degree for deep sleep to begin, which is why a hot room sabotages rest even when you do eventually nod off. The bedroom does not need to be cold, but it should be cooler than feels intuitive, somewhere around 16 to 18 degrees Celsius is the range most sleep researchers point to.
A few things that genuinely help, and one that mostly does not:
- A cool shower an hour before bed. Counterintuitively, warm-to-cool works better than cold alone, because the initial warmth brings blood to the surface and the body then dumps heat fast.
- A fan moving air across the room, which cools you through evaporation even when it cannot lower the actual temperature much.
- Swapping a synthetic duvet for a lightweight cotton or linen layer, or a single sheet, for these few weeks.
- A hot water bottle filled with cold water and tucked near your feet, an old trick that sounds odd and works surprisingly well.
- Closing the curtains and windows during the hot afternoon, then opening them once the outside air drops below the inside temperature, usually after ten at night.
The thing that mostly does not help: buying an expensive "cooling" mattress topper in a panic. Some are decent, but airflow and a cool head matter far more than what you are lying on, and you can fix airflow tonight for nothing.
Protecting your evening from the light
The hour before bed is where the longest day does its quiet damage, because the bright sky keeps telling your brain the day is still in full swing. You can push back on that without turning your home into a cave.
Dim the lights you control as the evening goes on, switching from overhead brightness to a single low lamp. Move screens away from your face in the last hour, not because blue light is the villain it was once made out to be, but because the content keeps your mind alert long after your body wants to slow. If you do scroll, the doomscroll before sleep is doing more harm through anxiety than through wavelength. A boring novel under a dim lamp will out-perform any blue-light filter ever made.
There is a real catch worth naming. For some women, especially anyone managing seasonal low mood that lifts in summer, the long light is genuinely doing good things for daytime energy and motivation, and clamping down hard on it can backfire. The goal is not to fear the light. It is to let it flood your mornings and your daytime, and gently dial it down in the final hour or two before sleep. If darkening your evenings starts to feel grim, you have probably gone too far.
What to do at 4am when the birds start
The early light brings its own particular misery: waking at four or five, fully alert, with hours to go before you have any business being up. The worst move is the one almost everyone makes, which is to lie there willing yourself back to sleep while the anxiety about being awake quietly guarantees you stay awake. The wakefulness feeds on the frustration, and forty minutes of clock-watching turns into a wrecked morning.
If you have been awake more than twenty minutes or so, get up. Go to another room, keep the lights low, and do something undemanding and a little dull until you feel sleepy again, then go back to bed. This breaks the association your brain is busy building between your bed and lying awake stewing. It feels like the opposite of what you should do, and it works far better than the grim alternative. Keep your phone out of it, because the moment you start reading the news or your messages, your mind switches on for the day and that is the night gone.
A small wind-down ritual in the evening earns its keep here too, not as a wellness performance but as a signal. The same three or four steps in the same order, a cup of caffeine-free tea, the curtains drawn, the lamp on, ten pages of something gentle, train your body to read them as the run-up to sleep. The ritual matters more than any single element in it. Skip the herbal-tea marketing and the £40 pillow spray; consistency is the active ingredient, and consistency is free.
When tiredness is telling you something bigger
Most midsummer sleep trouble is situational and passes as the nights draw in again from late June. But tiredness is also one of the body's bluntest messengers, and it is worth knowing when to listen harder. If you are sleeping a reasonable number of hours and still waking unrefreshed for weeks, if you wake gasping or your partner mentions you stop breathing, or if low mood and exhaustion are sliding into something that colours your whole day, that is a conversation with your GP, not a curtain problem.
For the ordinary version, though, the kind that arrives every June and leaves you frayed by July, be kinder to yourself than the season's relentless cheerfulness suggests you should be. You are not failing at summer. Your clock is simply reading a sky that does not match your life, and that is a fixable, ordinary, deeply human thing. Darken the room, chase the morning light, cool the air, and let the rest of the long day be exactly as bright as it wants.