Bad nights are disruptive to a person’s life. Fortunately, scientists are constantly learning more about the causes.
You can sleep when you’re dead, they say. In the meantime, though, circadian rhythms are best not tampered with.
You may think you’re resting, but your brain is fulfilling critical tasks from building memories to reinforcing learning to clearing toxins.
We spend one third of our time sleeping, but scientists still don’t know why. A prominent researcher reviews the most likely explanations.