The human body has a sleep requirement that varies from six to eight hours. Most people feel refreshed after an eight-hour uninterrupted sleep, while others are content with two or three short sleep cycles. If you feel comfortable and are alert with your sleep pattern, then it's OK for you to continue it. Remember, however, that a drastic, cyclic change in this pattern may adversely affect you. If you choose to have a night job, you're better off continuing it indefinitely, so that your biorhythm is not affected.
Dermabrasion is the sanding off of the outer layers of skin.
After a properly performed procedure, new skin from the deeper layer grows out to replace the old that was removed.