On the physical plane there are substances that "induce" and aid to sleep; they are called sleeping pills and are well known by a generation such as our own, sick with insomnia. Also on the moral plane there is a terrible sleeping pill. It is called habit.
A habit is like a vampire. The vampire -- at least according to what is believed -- attacks people who are asleep and, while it sucks their blood, at the same time it injects a soporific substance which makes sleep even lovelier, so that the unfortunate individual sinks into ever more profound sleep and the vampire can suck all the blood it needs. The habit of vice also lulls the conscience, so that one no longer feels remorse; one believes one is very well and does not realize that one is dying spiritually.