Many people - kids and adults alike - notice that when they wake up naturally from sleep, they feel more alert than if an alarm or another person, like a parent, wakes them up.
To understand how to sleep better, and why waking up naturally from sleep helps you feel more alert, you need to start by understanding sleep cycles.
The sleep cycle consists of four stages. One of these is REM, which stands for rapid eye movements. The other three are non-REM stages.
As the night goes on, the cycles contain less non-REM sleep and more REM sleep. This is why it's important to get enough sleep.
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