We must be careful with our eyes and our eating. Hashem has no nachas (joy) from Jews that are just going through the motions. When we eat improperly it causes drowsiness. When our eating is in kedushas and tahara (holiness and purity) it is on level of the Lechem haPanim (Show Bread) in the Holy Temple. Overeating and oversleeping is caused by a meaningless "life style". We think and talk about food and eating obsessively.