Sleeping is a normal and usual activity. It's impossible for someone to not sleep because everyday we do many things that need energy from our body. Once we use much, we need to sleep to recover for the next day.
However, while we sleep, what will happen around us?
What if an evil being is unleashed when you' are in a deep slumber? What if this monster preyed on someone when you are sleeping, but he or she appears to have died from natural causes such as heart attack or other disease? What about when you're very old; will this evil will take your life when you're asleep?
No one can notice it or stop it. It's powerful and deadly. It cannot do anything only when you are awake.
Now do you want to sleep?