I Slept In, So Why Do I Still Feel Sleepy?
When you wake after a longer-than-usual night’s sleep, you expect to feel refreshed, so it’s baffling when instead you feel even worse than on a normal morning.
Your body has a fixed sleep-wake rhythm (see Can I Make Myself More of a Morning Person?), and it starts to rev up your biological engines way in advance of the ordeal of waking. Long before your natural waking time, the powerful energizing hormone cortisol is released into your blood in increasing amounts. Cortisol boosts energy and motivation and increases the level of blood sugar in order to fuel the brain and muscles and get you moving. The moment you wake up, cortisol surges even further, helping to hurl you into ...
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