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Caffeine's Jolt Can Sometimes Be Short-Lived
Stimulant effect diminishes after days of insufficient sleep, study finds
Top Search Terms for Sleep Disorders
Are You Getting Enough Sleep?
The amount of sleep a person needs depends on many factors, including age. For example, in general:
- Infants require about 14-15 hours a day.
- Teenagers need about 8.5-9.5 hours on average.
- Most adults need 7 to 9 hours a night for the best amount of sleep, although some people may need as few as 6 hours or as many as 10 hours of sleep each day.
- Women in the first 3 months of pregnancy often need several more hours of sleep than usual.
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WebMD Special Sections
- Take Control of Your Sleep Apnea
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- Living With Insomnia: Get a Good Night's Sleep
- The Benefits of a Good Night's Sleep
- Sleeping Pills: What Consumers Need to Know
- Coping With Sleep Loss: Tips for a Brighter Day
- Slideshow: 12 Causes of Fatigue and How to Fight Them
- Slideshow: A Visual Guide to Sleep Disorders
- Slideshow: Foods That Help or Harm Your Sleep
- Your Wake-Up Call: Top Tips to Get Back to Sleep
- Sleep Quiz: Do You Know Your A-to-Zzzzs?

