موضوع تعبير بالانجليزية عن لماذا ننام

موضوع انشائي قصير باللغة الانجليزية عن لماذا ننام

English topics and essays

Generally, the reason for sleep is that the brain has work to do during sleep. The details are not fully understood, but it is important to get enough sleep for the body and the brain to be healthy and work properly. Usually animals (and people) sleep at periodic intervals, such as once a day. Certain animals send out signals to the others that they will soon go to sleep. Yawning is such a signal.

Both humans and many animals sleep about once a day. Some animals, such as cats, sleep many times a day for short periods.

When people sleep they often have dreams. Probably some animals do, too.

Not only people sleep, all mammals and birds, and most fish, reptiles and other animals do, too.