The second kind of sleep is samsaric sleep, the sleep of dreams. Samsaric sleep is called “great delusion” because it seems endless.

Unlike the sleep of ignorance, in which the gross moving mind ceases, samsaric sleep requires the participation of the gross mind and the negative emotions.

While it is the body that calls us to the sleep of ignorance, emotional activity is the primary cause of dream. The secondary causes are actions based in grasping or aversion.