Spring, summer, autumn, and winter each deliver a distinct physiological environment. Day length shifts at higher latitudes ...
Sleep is one of life’s most universal behaviors. Despite its ubiquity, it’s also one of the most mysterious. Humans spend about a third of their lives with their eyes closed and their brains in states ...
Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep and even jellyfish sleep. Sleep is universal “even though it’s actually very ...
The Sehgal Lab’s recent research suggests sleep supports brain cell energy needs and protects key cellular structures. This schematic shows what the researchers think is happening during periods of ...
It can be tough to calculate exactly how long you’re in REM, but many health trackers use your heart rate, heart rate variability, and data on your movements to make solid estimations. (Just know that ...
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How some species survive without deep sleep
Sleep is a universal need, yet not all animals experience it the way humans do. Some species never enter deep sleep, instead ...
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