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circadian rhythms

Circadian Rhythms
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Circadian Rhythms

Your body goes through daily, cyclical processes. Sleep and wake cycles are the most obvious, though researchers have discovered hundreds of other circadian rhythms, including hormonal level and blood pressure changes.

A part at the brain's base controls these rhythms. Patterns of light and dark, long-distance travel, and night shift work can affect them.

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Plants’ Natural Circadian Rhythm Genes Revealed

Plants’ Natural Circadian Rhythm Genes Revealed

What do plants — and even bacteria — have in common with humans? They all follow daily cycles of activity and inactivity. In plants, a dozen genes work together to set internal clocks. More...

Article
BBC
Respecting the Body’s Clocks

Respecting the Body’s Clocks

How well athletes do can depend on when they compete. In fact, more world records are broken in the evening, near the time our body temperatures are naturally at their highest. But why? More...

Article
Science News for Students
Biological Clocks ‘Beat Quicker’ in Cities

Biological Clocks ‘Beat Quicker’ in Cities

Urban German blackbirds lead a faster-paced life on less rest than their rural cousins. What could this mean for their health? How might a similar situation affect humans? More...

Article
BBC
Body Clocks

Body Clocks

Here’s something to try on a day when your schedule is free: Eat when you’re hungry and sleep when you’re tired. What do you think will happen? Find out how eating affects sleep — and vice versa. More...

Article
Science News for Students
Circadian Rhythms

Circadian Rhythms

What would happen if you lived in a cave and did not know if it was day or night? Would your body still know when to sleep and when to wake up? Find out! More...

Video
PhysioPsychology
Circadian Rhythms Fact Sheet

Circadian Rhythms Fact Sheet

What are circadian rhythms? Are they the same thing as biological clocks? What happens when we fly across time zones? Get the answers here! More...

Article
National Institute of General Medical Sciences
Daily Rhythm Test

Daily Rhythm Test

Answer 4 simple questions about your natural tendencies for sleeping and waking. Get a personalized chart that will show your peak activity times — and a time when a nap may be the best option! More...

Interactive
BBC
Games and Puzzles: All About Sleep

Games and Puzzles: All About Sleep

Establishing regular sleep habits makes your body and brain work better. Use these fun games and puzzles to learn more about healthy sleep. More...

Interactive
National Sleep Foundation
How Jet Lag Resets the Body Clock

How Jet Lag Resets the Body Clock

What does a hamster with jet lag have in common with an airline pilot? Messing with the natural light/dark patterns of a 24-hour day affects the brain — and not in a good way. More...

Article
KQED/QUEST
Rhythm and Snooze: Circadian Genes

Rhythm and Snooze: Circadian Genes

If you regularly stay up way late, you may be an owl. If you go to sleep early and wake up before dawn, you could be a lark. Discover how scientists are researching the genetic basis of sleep disorders. More...

Profile
Virginia Commonwealth University

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