Sex hormones reset our body clocks, research reveals

Disruptions to our circadian clocks—the internal molecular timekeepers "ticking" in nearly every cell of our body throughout the day—can lead to a wide range of health problems, from sleep disturbances to diabetes and cancer. ...

Why do I seem to get sick as soon as I take time off?

You've been hanging out for a break, getting through the busy last weeks of work or class. You're finally ready to relax. And then tiredness descends, you feel the tickle in your throat, and you realize you're getting sick.

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