Sleep is a natural state of bodily rest observed throughout the animal kingdom. It is common to all mammals and birds, and is also seen in many reptiles, amphibians and fish. In humans, other mammals, and a substantial majority of other animals which have been studied — such as fish, birds, ants, and fruit-flies — regular sleep is essential for survival. However, its purposes are only partly clear and are the subject of intense research.
the reason why i choose sleeping as my title is that i like to sleep and my hobby and interest is sleeping...
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