So if you are wondering why you’re still tired after 8 hours of sleep, this perfectly normal occurring phenomenon could be one explanation.
This feeling generally dissipates between 15 and 60 minutes after waking, but for some it can last longer. But if you're woken by an alarm, it could go off during a period of deeper sleep which might leave you feeling more groggy.įor most people, feeling tired when you wake up is the result of sleep inertia, which is a natural feeling you experience as you transition between being asleep and awake. In the last hour or so of sleep, your natural body clock releases cortisol and other hormones that prepare you to wake up, leading to you waking naturally, during a period of light sleep.
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