How Long Should It Take to Fall Asleep? What’s Normal and What’s Not
Most healthy adults fall asleep in 10 to 20 minutes. Under 5 minutes can mean you are sleep-deprived; over 30 minutes regularly can be a sign of insomnia.
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Why Do I Wake Up at 3 AM? 7 Common Causes and What Helps
Waking briefly between sleep cycles is normal. Waking at 3 AM and lying awake usually has a cause, from alcohol and stress to a too-warm bedroom. Here is what helps.
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How Much Sleep Do Teenagers Need? (And Why They Can’t Fall Asleep Early)
Teens need 8 to 10 hours of sleep, but CDC data show more than 7 in 10 US high school students get less than 8 on school nights. Here is why, and what helps.
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Can You Catch Up on Sleep at the Weekend? What Studies Show
Sleeping in at the weekend helps a little, but it doesn’t undo a week of short sleep. Here is what two major studies found, and a better way to pay back sleep debt.
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How Daylight Saving Time Affects Your Sleep (and How to Adjust)
Fatal car crashes rise about 6% in the week after clocks spring forward. Here is what the clock change does to your body, and a simple plan to adjust before November 1.
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How Long Does Caffeine Stay in Your System? (And When to Stop Before Bed)
Caffeine’s half-life is about 5 hours, so half your 3 PM coffee is still in your body at 8 PM. A sleep study found caffeine 6 hours before bed still cut sleep by over an hour.
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How Long Should a Nap Be? 10, 20 or 90 Minutes, Compared
In a sleep lab study, a 10-minute nap boosted alertness straight away and the effect lasted over 2.5 hours. Here is how 10, 20, 30 and 90-minute naps compare.
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What Is the Best Time to Go to Bed? What a Study of 88,000 People Found
In a UK study of 88,026 adults, people who fell asleep between 10 and 11 PM had the lowest rate of heart disease. Here is what that means for your own bedtime.
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Is 6 Hours of Sleep Enough? What the Research Says
For most adults, no. Sleep experts recommend at least 7 hours, and studies show 6 hours a night slowly builds a deficit you may not notice.
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How Long Is a Sleep Cycle? The 4 Stages of Sleep, Explained
A sleep cycle lasts about 90 minutes in adults, but anywhere from 70 to 110. Here is what happens in each stage, and why the timing matters when you wake up.
