During the day or at times when you shouldn't be getting ready to sleep? Definitely not. However if it is after a long day and close or past when you should be getting sleep (16-18 hours after waking up without consuming stimulants recently) - Probably pretty normal to get tired.
Not really sure what you mean by "too many times" with regards to sex. But with regards to masturbating, you could probably chafe or something depending on how you do it.
doing it too many times I mean doing masturbate again and again in a while, thanks for your reply men. yeah I do chafe too sometimes, and something like getting angry easier. I don't know why
masturbation takes a heavy toll in the human body primarily because of low testosterone level,
which make you're body tire out after 1-2 session
unlike sex where the full swing of testosterone is super high, you feel rejuvenated & energized
not to mention full body blood circulation is good for your body