The human body was created to have time to sleep and rest, hints to why there are nights where we are not capable of seeing. Use your time wisely enough so that you are able to sleep each day, it is part of our creation, no matter what you believe religiously or even if you do not believe in religion. However we got here, we are suppose to sleep, and there is no reason not to. There are twenty four hours in each day, so plan your time accordingly so you are able to sleep and rest. Sleeping is good for you and makes you feel much better psychologically and physically.