People on TikTok and other social media say they feel more alert when they have had fewer hours of sleep—but sleep scientists ...

Waking up after eight hours of sleep should feel refreshing. Yet, many people open their eyes feeling just as exhausted as when they went to bed. It's ...

Sleep quality matters more than quantity. Learn why you might still feel tired despite getting eight hours of sleep and how ...

I t's amazing how many problems can be solved with good sleep hygiene. If you often feel low on energy, one of the first ...

A lack of sleep is probably the most obvious (and most common) reason for why we feel exhausted. According to the National ...

Part of cortisol's impact is mediating the stress response — that fight-or-flight instinct that allows you to deal with ...

Generally, it should take 24 to 48 hours to recover from a long run. “More experienced runners who have built a strong ...

“Some birds can function surprisingly well on far less sleep than we can, but even that strategy appears to have its limits. We have found that when they’re tired, jackdaws are more likely to sleep ...

A study on birds finds that when jackdaws are sleep-deprived, they stop sleeping with one eye open and enter deeper sleep, risking safety.