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?
You need to decide if health is more important to you or wealth. If you do not sleep well, it can impact your health. What's the benefit of the money if your health is not good ?
Also I don't think that Elon musk sleeps only 4 hours a day. He has a lot of people who are doing the work for him.