We all have experienced different types of dreams. Some dreams make more sense while some are completely irrational.  Some dreams clearly jump from one point to another while some keep flowing in a narrative. Some dreams are well structured while some are completely bizarre. Some dreams are good while some are bad. The research suggests that this is because of the physiology of the brain. A possible reason is that the hippo cortex and the neocortex are in communication while we undergo different phases of sleep. We have already seen that we dream in all stages of the night i.e., REM sleep and NREM sleep. We have also seen that the dreams are the fragments of the places we have visited, faces we have known and the experiences we have been through.