deep sleep
The slowest, most settled stage of sleep, when it’s hardest to wake someone. Most of it comes in the first part of the night.
Where it comes up
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01
How do I get through the day after a bad night?
Barely slept? How one short night really affects your day, what helps you get through it, and why tonight's sleep will probably be deeper.
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02
Are naps good for you?
Are naps good or bad for you? How long and when to nap, why a long nap can leave you groggy, and how a nap changes the night ahead.
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03
How long does caffeine stay in your system?
How long caffeine stays in your body, why an afternoon coffee keeps some people up, and how it can thin deep sleep even if you fall asleep fine.
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04
Why do I keep waking up at 3am?
Waking at 3am and can't get back to sleep? Why it happens in the second half of the night, why it feels so bleak, and one small thing to try now.
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05
Why am I still tired after a full night’s sleep?
Slept seven or eight hours and still woke up exhausted? Why mornings feel so slow, from sleep inertia to body-clock timing, and when it's worth a doctor.
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06
What happens while we sleep?
What happens while you sleep: light, deep and REM sleep, how the cycles repeat through the night, and why brief wakings are a normal part of it.
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07
What is deep sleep, and am I getting enough?
What deep sleep is, why it comes early in the night and thins with age, and why a tracker's deep sleep number is only a rough guess.
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08
Why does my sleep change as I get older?
Why sleep gets earlier, lighter and more broken as you get older, which changes come with age itself and which come from something else, and what still helps.
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09
What makes us feel sleepy?
Why sleepiness builds the longer you're awake, how the body clock puts it off, and why caffeine, naps and sleeping in work the way they do.
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10
What are night terrors, and what should I do when my child has one?
Your child is screaming but doesn't seem to see you. What night terrors are, how they differ from nightmares, what to do and when to see a doctor.
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11
Why do people sleepwalk, and should I wake them?
Why sleepwalking happens, why it's so common in children, whether it's safe to wake a sleepwalker and how to lead them back to bed.
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12
What makes a bedroom good for sleep?
What makes a bedroom good for sleep: why cool, dark and steady sound matter, what's mostly marketing and what helps if you share a bed or sleep by day.
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13
Why are some nights better than others?
Why you sleep well one night and badly the next: how your day, wake time, light and hours awake shape tonight's sleep, and why some variation is normal.