- Sleep gives the body a chance to repair muscles and other tissues, replace aging or dead cells, etc.
- Sleep gives the brain a chance to organize and archive memories. Dreams are thought by some to be part of this process.
- Sleep lowers our energy consumption, so we need three meals a day rather than four or five. Since we can’t do anything in the dark anyway, we might as well “turn off” and save the energy.
What we all know is that, with a good night’s sleep, everything looks and feels better in the morning. Both the brain and the body are refreshed and ready for a new day.
(Source: How Sleep Works)