Dream is a series of thoughts, images ,feelings,sounds. Dream isn't the one that doesn't let us sleep....right!! Nightmare the unpleasant dream....that cause fear... Sadness,and make us wake up in the middle of the dream!!! A person awaken after a nightmare may be unable to return to sleep for a certain period of time!!! Some believe dreams have no function... Others believe they serve some intense emotions, !! Some believe dreams stimulate day to day life things...All Rights Reserved