Chandramauli Swami: Prabhupada said that out of the four bodily activities - eating, sleeping, mating and defending, the most dangerous one for a devotee is oversleeping because it leads to the others. He said, "First of all if you sleep too much you're wasting time that should be used for Krishna's service. And secondly, too much sleep enhances the attraction for eating and for mating." That shocked me. I thought another one of the bodily activities was the most dangerous.
Reference:Memories Anecdotes of a Modern Day Saint - Volume 3 by Siddhanta Dasa