A person doing consistent, unproductive activities during creature hours. Different varieties include cave creatures, studious creatures, feral creatures, and others. Once a creature has gone to bed and/or "passed out" for the night they are no longer a creature.
The boys were such creatures last night that they went to get more beer at midnight.
A time period between midnight to 6 am where unproductive college students party and or do substances in a consistent manner. Acts performed during this time include beer pong, beer die, darts, listening to music, and puking.
Devon was drinking so much during creature hours that he missed his 8 am.