What time do you go to bed? What time do you usually get up? How much time do you have for sleeping?
I heard that some people (like Elon Musk) sleep for 4 hours in order to have more time to do things during the day. Is it dangerous to health?
I'm pretty sure that 8 hours of sleep is still the norm. But of course depending on your number of jobs and working hours will affect your sleeping hours. Personally, I take a a lot of Vitamins C and, making sure that I stay healthy.