4 Reasons Why You Wake Up Feeling Tired
Briefly

To wake up feeling refreshed, your sleep must balance both internal and external factors, encompassing diet, brain chemistry, environment, and sleeping arrangements.
In the hours before waking, REM sleep dominates and leads to a buildup of adenosine, which causes feelings of drowsiness due to its inhibitory effect on arousal.
Research shows that while women may experience reduced sleep quality when sharing a bed with a male partner, having sex beforehand can improve subjective sleep experiences.
Men's sleep efficiency is unaffected by sharing a bed with a female partner, indicating differing impacts of sleep arrangements based on gender.
Read at Psychology Today
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