How Do Animals Sleep?
Sleep is a basic necessity for most animals. Human will feel tired and lose concentration in the day if they have not had a good night’s sleep at night. So how do we know if a person is really asleep? When we are sleeping, we seldom hear anything unless there is a very loud sound. Some people are heavy sleepers and do not even wake up when there is loud sound. Others are light sleeper and wake up at the slightest noise they hear. Most of us will lie down when we sleep. This is the universal position. Of course there are people who like to meditate in a sitting position while they sleep. Besides that, most humans close their eyes when they sleep. In the animal kingdom, we know that the invertebrate fishes do not have eyelids. That is why we never see them with their eyes closed. To us, they open their eyes even when they sleep. A person who sleeps well also breathes slowly with rhythm. Our body is completely relaxed while we sleep and our body will move occasionally. This will happen a
