People who compensated for sleep deprivation with catch-up sleep did not have an increased risk of mortality. People who consistently slept too little without ever making it up did

We tend to think that fatigue is about the number of hours we sleep. Eight hours is good. Seven is borderline. Six is a problem. But what many people don’t realize is that you can sleep a perfect eight hours and still feel exhausted. Not because you lack sleep, but because you lack regularity.

You can reduce the effects of jet lag with a few smart hacks.