How to sleep the night before a big day, and what one bad night really costs

The best way to sleep the night before a big day is to keep your usual routine, give your worries somewhere to go before bed, and stop trying to force sleep. It also helps to know that one rough night usually costs less than it feels like at 2am. In one study of college students, sleep on the single night before a test wasn't linked to the score at all, while sleep over the previous week and month was. Here's what the research says, and a simple plan for an interview, exam, wedding or any other day that matters.

Why can't you sleep before a big day?

You can't sleep before a big day mostly because worry keeps your mind busy at the moment you need it to switch off. The NHS lists stress and anxiety among the most common causes of trouble sleeping, and its Every Mind Matters service says worry, stress and anxiety can make it harder to sleep.

Big days often come with a strange bed, too. A wedding hotel, a trip for an interview or a friend's sofa before an exam all add something researchers call the first-night effect. A 2016 study in Current Biology found that on the first night in a sleep lab, a brain network in one hemisphere slept less deeply than the same network in the other, and that less-sleeping hemisphere reacted more to unusual stimuli, acting as a kind of night watch. The bigger that difference, the longer people took to fall asleep. The effect wasn't seen in the later sessions, which is a good argument for arriving a night early when you can.

How much does one bad night actually matter?

One bad night matters less for how you perform than most people fear, but it can make you feel more on edge. In a 2019 study in npj Science of Learning, 88 students in an introductory college chemistry class completed the study wearing activity trackers. Better quality, longer and more consistent sleep went with better grades. But there was no relation between sleep on the single night before a test and the test score. Sleep over the week and the month before was what counted, and sleep measures explained nearly 25% of the differences in grades.

That's reassuring, but a short night isn't free. A 2019 study in Nature Human Behaviour linked sleep loss to higher anxiety the next day, and found that even modest night-to-night drops in sleep predicted rises in next-day anxiety.

Put together, the useful lesson is this. The week before matters more than the last night. And if you wake up after a poor night feeling jittery, some of that is the short sleep talking, not a sign that the day will go badly.

How should you prepare in the days before?

Prepare by protecting your sleep across the whole week, not just the final night. The NHLBI suggests going to bed and waking up at the same time every day, keeping weekends within about an hour of weeknights, getting outside and being active during the day, and avoiding caffeine later on, since its effects can last up to 8 hours. Our guide to caffeine and sleep has more on timing.

Resist the urge to go to bed hours early on the big night. The NHS advises only going to bed when you're sleepy. Climbing into bed at 8pm "to be safe" usually means lying awake rehearsing tomorrow.

This is also the week to sort out anything that disturbs your nights, such as a nose that blocks up or a mouth that falls open and dries out. Don't make the night before your first try with any new sleep product. If you'd like to try something like the Titan Sleep System, start a couple of weeks ahead, so it already feels routine by the big night.

What's a good wind-down for the night before?

A good wind-down is about an hour of quiet, low-light time that looks much like any other night. The NHS suggests relaxing for at least an hour before bed, for example with a bath or a book, and keeping phones, tablets and computers away for that hour. The NHLBI recommends using the hour before bed for quiet time, avoiding bright screens, and trying a hot bath or relaxation techniques.

What you eat and drink matters too, which is worth remembering at a rehearsal dinner or a pre-interview meal. The NHLBI suggests avoiding heavy or large meals within a few hours of bedtime and avoiding alcohol before bed. The NHS says alcohol and nicotine can disrupt sleep and suggests avoiding them for 1 to 2 hours before bed.

Then empty your head onto paper. In a 2018 sleep-lab study, 57 healthy young adults spent 5 minutes writing before lights out. Those asked to write a to-do list for the next few days fell asleep significantly faster than those who wrote about tasks they'd already finished. The more specific the list, the faster they fell asleep. For a big day, that might be your route, your outfit, the documents to bring and the first thing you'll say. Our guide to falling asleep faster covers this and other tactics.

Which breathing exercise helps you calm down?

A slow, steady breathing exercise is the simplest way to calm down in bed. The NHS breathing exercise for stress goes like this:

1. Get comfortable lying down, with your arms a little away from your sides.
2. Let your breath flow deep into your belly without forcing it, breathing in through your nose.
3. Breathe in gently and regularly, counting from 1 to 5 if that helps.
4. Let it flow out gently, counting from 1 to 5 again.
5. Keep going for at least 5 minutes.

The NHS notes you'll get the most benefit if you practice regularly, so try it on a few ordinary nights before you need it. The research is encouraging. A 2023 meta-analysis in Scientific Reports pooled 12 randomized trials and found breathwork was linked to lower self-reported stress than control conditions, with a small-to-medium effect, and similar results for anxiety. The authors also urged caution about hype, noting most of the trials were at moderate risk of bias. For more options, including 4-7-8 breathing, see breathing exercises before bed.

What should you do if you still can't sleep?

If you still can't sleep, stop trying. The NHS says that if you're lying awake, try not to force it; if you're still awake after around 20 minutes, get up, sit somewhere comfortable and do something relaxing like reading or listening to quiet music, then go back to bed when you feel sleepy. It also suggests keeping clocks out of view, which has the bonus of stopping you doing sums about how many hours are left.

Remind yourself of the chemistry students. A shorter night before a test wasn't tied to their scores, so lying there calculating the damage only feeds the worry that's keeping you awake.

In the morning, get up at your normal time. The NHS advises against sleeping in after a bad night's sleep.

What does a simple plan look like?

Here's the whole plan in one place.

Could your breathing be keeping you up?

Your breathing could be part of the problem if a stuffy nose or a dry, open mouth tends to wake you. Waking with a parched mouth or a sore, dry throat is a common clue. Our guide to how to unblock your nose before bed covers quick fixes.

For adults with a clear nose whose mouth falls open at night, nasal strips and mouth tape are simple things to try, as long as you start well before the big night. Check that you can breathe comfortably through your nose with our nose test, and read how to start mouth taping for the first week. We don't recommend mouth tape for children.

When should you see a doctor?

See a doctor if poor sleep is more than the odd night before a big event. The NHS suggests seeing a GP if changing your sleeping habits hasn't helped, you've had trouble sleeping for months, or it's affecting your daily life in a way that makes it hard to cope. A GP may offer cognitive behavioral therapy, which our page on CBT for insomnia explains.

The NHS also says to see a GP if your breathing stops and starts while you sleep, you make gasping, snorting or choking noises, or you always feel very tired during the day, since these can be signs of sleep apnoea. Our sleep apnea warning signs page has more. See a doctor if your nose is blocked most nights, and if you're pregnant, ask your midwife or doctor before trying any new sleep product.

Our pick (paid partner): Titan Sleep System

If a stuffy nose or a dry, open mouth is part of what disturbs your nights, our pick is the Titan Sleep System. We haven't tested or ranked sleep products ourselves, and it won't take away pre-event nerves. This is our recommendation for the breathing side of a good night, based on how Titan describes the system.

The system pairs TitanAir Nasal Strips with Titan Bamboo Silk Mouth Tape as one nightly routine. Titan describes the strips as drug-free external nasal dilators with flexible spring-loaded bands, worn just above the flare of the nostrils on the soft part of the nose. It describes the tape as a soft, breathable bamboo silk strip in one oval size, 76 by 38 mm, worn horizontally across the lips, and suggests 20 to 30 minutes of daytime practice before the first night.

That practice advice fits this article well: start the Titan Sleep System a couple of weeks before your big day, not the night before. Titan says every batch is third-party tested and certified PFAS-free, and its 30-night guarantee refunds you if your sleep isn't better after 30 nights.

Read next

• How to fall asleep faster: what the evidence supports
• 6 breathing exercises to try before bed
• What to pack for better sleep when you travel

* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.