I am very much intrigued by the subject of Neuroscience and have read few publications on the same. The science touches 'Dream' subject often and my understanding is we still don't know why we dream, there are some suggestions though. Dreaming is mostly associated with the information the brain has already recieved which is then manipulated, often strangely. A study was done (newsday) and found out that the part of the brain that is involved in emotion process is heavily active in dream. Thus we get up shouting, crying ,laughing sometimes. However, the part of the brain mostly involved in logic processing (hypocampus?) is the least used while we dream. Some people do solve few lingering problems in dream, such as the inventor of the benzene chain dreamed of 6 monkeys in a chain. This suggests logic processing is involved in dreams for few (wouldn't it be great if we know how to use that part in brain all the time). We dream during Rapid Eye Movement (REM) period. Since this period is so specific, there must be some reason we dream. Some guesses (mine included): 1. Shiled off the subconsious part of brain whose information is being heavily processed, from consious part of brain which is now active in Dream 2. I beleive I read in Newsday that we might be dreaming to prepare ourselves from future, unexpected condition. Like to cope with Death and conditions you might be afraid of (like failing or arriving late in exams) 3. To straighthen the synapses in brain without recalling the event (Synapses form the memory network in the brain and are thickened everytime information is retrieved from them). Dream might be just a funny trick from the super natural(the creator?) or there might be deeper meaning to it. Whatever it is, it is a funny subject. Lets discuss/research it more, may be we can goto a conclusion?