You can't remember a time when you felt more relaxed. If you are like most college students, you often suffer from sleep deprivation. The very fact that sleep deprivation has been employed in torture, to extract confessions and as a brainwashing technique should be a clue that inadequate amounts of sleep detract from proper brain function.
Sleep deprivation is second only to drunkenness as a cause of automobile accidents.
I learned my lesson the hard way. I have never allowed myself to sleep much during finals week. After one particularly grueling week of finals, I quickly loaded up my car and hit the road to beat spring break traffic. Luckily, I did not suffer any serious injuries. My car was not as fortunate.