sleep inertia
The groggy, slow feeling just after waking, before the brain is fully up to speed.
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
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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04
How do I sleep well on night shifts?
Why sleep after a night shift is short and light, and what helps: when to sleep, a nap before work, light and darkness, and guarding day sleep at home.
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05
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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06
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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07
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.