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People feel lazy from waking up in the morning for different reason like lack of motivation to work for that day, been tired from yesterday work, lack of sleep during the night. Other reasons why people feel lazy includes not been able to move your body because its been in the same position for too long, drinking too much of alcohol before sleeping, eating too much before sleeping, and too much stress. There may be others reason why people feel lazy to wake up in the morning bit this are the ones I know of.
I hope I have been able to contribute to your answer.