REM sleep
Rapid eye movement sleep, often called dreaming sleep: the stage when most vivid dreaming happens. The eyes move quickly beneath the lids while most of the body’s muscles stay relaxed and still.
Where it comes up
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01
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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02
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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03
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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04
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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05
Why can’t my teenager fall asleep before midnight?
Teenagers’ body clocks really do shift later. Why your teen isn’t sleepy at 10pm, what school start times do, and how to help without a nightly fight.
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06
What is REM sleep?
What REM sleep is, why your body can’t move while your brain is nearly awake, why it gathers toward morning, and what it may do for memory.
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07
Why do I keep having nightmares?
Why nightmares keep coming back, what makes them more likely, and how rewriting a bad dream while you're awake can ease them, with when to talk to someone.
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08
Why do we dream?
Why we dream, why dreams are so strange and borrow from yesterday, and what the main scientific theories say dreams are for.
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09
How much should my newborn sleep, and how do I keep them safe?
How much newborns sleep, why they wake every few hours and mix up day and night, when nights lengthen and how to put your baby down safely.
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10
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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11
What is narcolepsy, and could I have it?
Sleepy all the time, or woke unable to move? What narcolepsy is, how it differs from ordinary tiredness, its signs and how it's diagnosed.
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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.