Los of our beloved people is very unhappy to every one, so when someone takes long time to wail it can get carried away with dream when our body slow energy uses. In the other case, as scientis is not seldom finds their idea in dream because of his diligence in loving the knowledge. On of the scientis occur this is Kelkule that formulates the chemical structure of benzene in its dream.
I think this is happen because when our body need less energy, the energy focused on the imagination. But in othe case we can’t denying about real dream, it can be occur.