A natural state of rest when your body and mind are not active in the usual way, and you are not aware of what is happening around you. Sleep helps your body repair itself and your brain process information.
“Sleep” comes from Old English “slǣp,” from a very old Germanic root shared with German “Schlaf.” It likely goes back to an Indo‑European root connected with being weak or slipping away. The core meaning of rest and unconsciousness has stayed stable for thousands of years.
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