Musar sur Les Proverbes 19:15

Comparable is the instance of one who is too lazy to study the Torah and to observe the commandments, for the indolent love rest and as a result find God's commandments difficult for them and the study of the Torah burdensome. And so they flee from study to rest. When they do sit in the synagogue they sleep, as it is said : "Slothfulness casteth into a deep sleep" (Prov. 19:15). For laziness creates a desire for sleep. King Solomon warned us long ago, "Yet a little sleep, a little slumber, a little folding of the hands to sleep" (Prov. 6:10).