For correct living, however, it is essential to differentiate between sleep and rest. At rest the body is disturbed by all exterior noises; but in sleep it is screened from them by partial loss of consciousness. During rest the limbs are normal, but in sleep they swell. Blood flows from the brain, distends the arteries, and makes the limbs bigger. In sleep more muscles are relaxed than in rest, though without knowing the sleeping person changes his position about 35 times in one night. Many organs, which work during rest, suspend their activities in sleep. Thus, the recouping value of sleep is much more than that of rest or simple lying down.
New born: 18 to 20 hours
Growing children: 10 to 12 hours
Adults: 6 to 9 hours
Aged persons: 5 to 7 hours
Throughout the sleep the depth of ordinary restful sleep fluctuates. In most adults, sleep deepens through the first hour, after which it lightens rather sharply and then more gradually until morning or until the usual time of wakening. However in growing children sleep deepens a second time for a little while. Two hours before and two hours after midnight are the most valuable for sleep of all the twenty-four hours of the day and in at this time, the mental and physical vigour are at their lowest ebb and sleep is soundest and most natural.
Sleeping well is an art. It needs a perfect blend of healthy habits and control of mind. A clean body and mind, relaxed mood, physical exercises, and perfect dietary control are some of the basic sleep-inducing methods. The sleeping place should be well ventilated, with balanced temperature and free from noises. The bed should be neither too hard nor too soft, but comfortable. The pillow should not be too hard or too high. The bedclothes should be loose-fitting and light coloured. Another important rule is not to eat heavy food shortly before bedtime.
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