I think the reason why we sleep is because sleep helps us recuperate. Lisa Shives, founder of Northshore Sleep Medicine in Chicago states that sleep is a quiescent period where the cells are doing a lot of repairing. If you don't get enough sleep you aren't able to fight of illnesses but when you get at least 7 hours of sleep your immune cells are repairing and getting stronger. A young men in the diabetes study returned to a normal state of glucose tolerance after just a few nights of regular sleep. Many of these conditions will repair themselves after a regular sleep. If we wouldn't sleep a lot of people would not be in a good state either because of illness or obesity, or mentally.

I think ghost are real because I have kinda experience it and heard ghost stories from my family that has happen to them. Also, I seen a lot of ghost shows and it actually looks real. I always believed that the death come back as a spirit. In my house one time I had a glass on the top of counter and it fell and literally broke into million of pieces. Which is impossible because it didn't even hit that hard.