There are a plethora of reasons:
1) You have a habit of staying up late at night all the time
2) You are a night owl
3) You're overworked and exhausted
4) You have slept less than 6 hours at least
5) Sleep disorders
and many more. If you need more information, it is best recommended that you do some more research, and if necessary, consult a health professional within your area.
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