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Why do we need sleep?

No one really knows why we need sleep but there are theories:

  • Sleep can give the body time to repair muscles and other tissues and to replace aging or dead cells.
  • Sleep can give the brain time to organize and archive memories. Some people think dreams are part of this process.
  • Sleep can lower our energy consumption, so we need only three meals a day rather than four or five. We can't do much in the dark anyway, so we might as well "turn off" and save energy.
  • Sleep might be a way to recharge the brain.

What we do know is that, with a good night's sleep, everything will look and feel better in the morning. Both the brain and body are refreshed and ready for a new day.

Continue Learning about Sleep Basics

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.