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.
For most organisms the absence of light is vital, too.
One of the basic certainties that unites all life on this planet: night follows day follows night. But then we started to mess with it.
Everyone knows that animals use odours to communicate. Now a growing body of research suggests that humans do, too.
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