When you wake up naturally, you may be doing so at the end of a sleep cycle, particularly if you’re in the lighter non-REM stages or REM. This means you feel more refreshed and alert. In contrast, waking up from deeper sleep stages triggered by an alarm often results in grogginess.
The sleep cycle consists of multiple stages, each serving different functions. Falling asleep often means entering lighter sleep stages, while REM sleep is crucial for brain functions.
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