Circadian rhythms are 24-hour cycles determining periodicity in various physiological processes, including nervous system activity and hormone production, which influences sleeping and feeding ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. January 12, 2026 Add ...

If you’ve ever been to a concert or sat too close to a loudspeaker, you’ve likely experienced ringing in your ears afterward. But if you often hear a sound that’s in sync with your heartbeat or a ...

The nervous system is never silent, and neurons often show daily rhythms in their gene and electrical activities. These rhythms arise from near 24-hour feedback loops that involve identified genes and ...