The human brain is capable of processing our various experiences in ways which are very subtle and unexpected. Most people feel refreshed after a hot shower and many solutions to problems occur to us during such relaxing experiences. It is said that Newton came up with the theory of gravity when an apple fell on his head when he was sitting under an apple tree. The idea may have already occurred to him as he was sitting in a relaxing pose in that garden. The apple falling on the head probably just brought forth the already formed idea.