It is as well to keep a diary of dreams. Dreams are an effort by the brain to align, evaluate and sort out, the data received during the day. It may take a little time to learn how to interpret them. A number of cults advocate sleep deprivation. This is so that the brain does not do the work of the cult, by sorting out problems, and thus depriving the cult of money.
Most people do best on at least eight hours sleep a night.
The preferred method of passive meditation, is to let the mind wander, between the time of going to bed, and going to sleep. A balance must be set between setting objectives, and letting the consciousness roam freely. Many of the higher aspects of the mind and the Universal Subconscious, are available. The higher aspects are written in conceptual language. They are then dreamed in pictorial language.