Dream is a series of events or pictures which come across in our mind when we are asleep. They are often similar to real life in some ways, but can also be very strange. Dreams usually appear to be so real while they occur that we are led to think that we are awake. But actually we are asleep when we are dreaming.

Sleep is a state of rest, which occurs in animals and human beings. Animals that sleep are in unconcious state or mostly so when they are asleep. Most of the muscles that animals can control on purpose are inactive during sleep. When animals sleep , they do not react to stimuli as fast as those that are awake.


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