A person sleeps when his body needs rest. This natural phenomenon is common in humans, reptiles, birds, and almost every living creature. Sleep refreshes the brain as well as the body. While sleeping the person does not get to hear any kind of noise until and unless it is a loud one. The body muscles are relaxed and the heart beat slows down with the brain crazy things. The person sleeping grows unconscious to the events surrounding him. He can be woken up, if the stimulus is somewhat strong, with a shake or a loud noise. This is the biggest difference between a person sleeping, fainted or in a situation of coma.

It is not just the humans who sleep, the reptiles, birds and animals also take their sleep for a certain time period. They become insensible to the outer word while they are at sleep. But there are a few amphibians ho only become half-unconscious and retain rest of their consciousness. It seems that the insects never sleep but it has been observed that they become still for a certain time be it broad daylight or dark. It has been discovered that all the mammals tend to dream, but the reptiles do not. The birds dream a little and a cow only dreams when it is lying down (although it can sleep while standing also).

All the parts of human body work together, although each  one has its especial part to do. The stomach must have a  time to rest between meals. The other parts of the body require rest, too. This they usually get while we are asleep. We must not be neglectful and fail to give them enough rest, or they will soon get worn out and give us trouble. 

Sometimes, when people are not well or are all tired out, they find they cannot sleep well at night. There are a number of little things that can be done to induce sleep. A warm bath before retiring, followed by a gentle massage, especially along the spine, often will, by relaxing the nerves and muscles, produce very good results. A hot foot bath, which draws the blood away from the brain, frequently will be found beneficial. A glass of hot milk or cocoa, taken just before retiring, often will have the same effect. If the sleeplessness is a result of indigestion, a plain diet will relieve. Sleeping upon a hard bed without any pillow sometimes produces the desired effect.

After the pregnancy the more the act of simply turning over in a bed gains grounds of difficulty. Many women find that wearing silk or satin pajamas can aid in changing positions. Many women find that sleeping in butter is the only thing more efficient because these materials are slippery surfaces.

Choose a Side: Find a position if your stomach feels too much pressure against it. Trying to sleep on your stomach will become increasingly impossible as the baby grows. Some doctors specifically recommend that pregnant women sleep on the left side. This promotes optimal blood flow to your body and uterus which is important in keeping limbs from falling asleep. Because it allows for maximum blood flow to the fetus and improves kidney function in the mother. Lying on your back or sleeping on your left side is not recommended, as this can compress your inferior vena cava and also doesn’t interfere with these blood vessels, allowing them to do their job.