Why is lying down and resting with your eyes closed but awake not as restful as actually sleeping?
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Think about yourself as a computer, with your brain as an operating system. There needs to be certain maintenance functions performed regularly, like daily updates to the software. Some of these can be patched while the system is running, but very rarely. Most require the “Your computer must be restarted to apply this update” because there’s too much stuff running and in memory.
Closing your eyes and relaxing is like closing all running apps. Sure, it clears up some stuff, but all your background processes and drivers are still running, taking up resources you need to function normally. Sleeping allows only the bare minimum to be running so the brain can get as close to maximum efficiency as possible.
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