How Long Does It Take to Fall Asleep? What's Normal, Too Fast and Too Slow

Most healthy adults fall asleep in about 10 to 20 minutes. Anything up to 30 minutes is generally considered fine. Regularly falling asleep in under 5 minutes can mean you're short on sleep, while regularly taking longer than 30 minutes can point to stress, a body clock that's running late, or insomnia.

The time it takes you to fall asleep has a name: sleep latency. It's one of the simplest clues you have about how well your sleep is going.

What's a normal sleep latency?

When the National Sleep Foundation brought together a panel of sleep experts to define good sleep quality, sleep latency was one of the measures they agreed on. Falling asleep within about 30 minutes was considered a sign of good sleep quality for most people, while regularly taking much longer than that was seen as a sign of poorer sleep.

Here's a practical way to read your own number:

These are rough guides, not diagnoses. One slow night after a stressful day means nothing. A pattern over weeks is what counts.

Falling asleep too fast

"I'm asleep the second my head hits the pillow" sounds like a good thing, and plenty of people are proud of it. But a well-rested adult usually takes a few minutes to drift off. Crashing instantly every night often means your body is catching up on sleep it's owed.

Other signs you might be running short:

• You need an alarm every day and hit snooze
• You doze off when sitting still, like on the couch or in meetings
• You sleep much longer on days off

If that sounds familiar, see signs you are sleep deprived and check your running total with the sleep debt calculator. If you fall asleep instantly and still feel very sleepy during the day, or someone has noticed you snoring loudly, gasping or pausing your breathing at night, talk to a doctor.

Falling asleep too slowly

Taking 30 minutes or more on a regular basis is common, and usually has an ordinary cause:

• Going to bed before you're sleepy. If your body clock runs late, an early bedtime means lying there waiting.
• Caffeine too late in the day. Caffeine can linger for many hours. The caffeine calculator shows your personal cutoff.
• Bright screens in bed. In one study, people who read on a light-emitting tablet before bed took longer to fall asleep than when they read a printed book, and their body clocks shifted later.
• A racing mind. Worry, planning and replaying the day can keep you alert long after the lights go out.
• Napping late. A long nap in the late afternoon reduces the sleep pressure you need at night.

When to see a doctor

If it regularly takes you more than 30 minutes to fall asleep, most nights, for several weeks, and you feel tired or low during the day as a result, that's worth raising with a doctor. Insomnia is common and treatable, often without medication.

What to do if you can't fall asleep

1. Don't watch the clock. Checking the time adds pressure and keeps you alert.
2. Get up if you've been awake a while. If you're still awake after what feels like 20 minutes, many sleep specialists suggest getting up, going somewhere dim and doing something calm until you feel sleepy. More in lying in bed awake.
3. Keep your wake-up time fixed the next morning, even after a bad night. Sleeping in makes the next night harder.
4. Move bedtime a little later if you're consistently lying awake at the start of the night. Less time in bed, but more of it asleep, often helps.

Use your number in the sleep calculator

The sleep calculator assumes 15 minutes to fall asleep, which sits in the middle of the normal range. If you know you're faster or slower, adjust:

• About 5 minutes: your ideal bedtime is 10 minutes later than the calculator suggests.
• About 30 minutes: go to bed 15 minutes earlier than the calculator suggests.
• Much longer than 30 minutes: fix the cause first. Going to bed even earlier usually just adds more time lying awake.

To see how your time in bed compares with your time actually asleep, try the sleep efficiency calculator.