Only you can decide if you waste time. It depends on what is important for you in life. Some people need to be around with people to be happy all the time. Others (like me) need goals to reach. I personally watch less TV and use this time instead for writing articles on Steemit. If your body needs 10 hours sleep then do it! My life experience says that health is the main thing in life! Without health you dont earn money, you cannot take care of a partner and children, you cannot meet friends, cannot travel, etc. So, give your body what it needs and what you need to happy.