According to scientists, there is no exact evidence on why we dream. We have clues on why we dream because we remember images and bits of information from our own experience. Since, however, memories are hard to prove, research scientists rely on biological data and form conclusions from their research. Some biological researchers believe that dreams have no other function that to discharge cellular waste and refresh the brain upon waking.

Rapid eye movement (R.E.M) and also well-known stages of sleep and d-state are areas studied by biological researchers. Biological data usually gathered by attaching electrodes to points on a person’s head. These points will generate electronic impulses that will be monitored and recorded. Different waves show the different stages we are at during sleep. Past research has concluded that these are stages of sleep and related ways in which the body reacts physically to these stages, In this section you will find more detail on what these stages are.