n sleeps in the bath tub expresses this fact by
saying that "he sleeps faster" there than in bed.

Sleep may also be induced by monotonous sound, or lack of sound, or the
monotonous holding of the attention. Keeping awake is due to continued
change and interruption or arrest of the attention.

Exercise taken in the afternoon will often promote sleep at night in
those who find sleep difficult. Slow, deep, rhythmic breathing is useful
when wakeful, partly as a substitute for sleep, partly as an inducer of
sleep.

Sleep is Nature's great rejuvenator, and the health-seeker should avail
himself of it to the full. Our sleep should not only be sufficient in
duration but also in intensity, and should be regular.

[Sidenote: Hours of Sleep]

The number of hours of sleep generally needed varies with circumstances.
The average is seven to nine. In general one should sleep when sleepy
and not try to sleep more. Growing children require more sleep than
grown-ups. Parents often foolishly sacrifice their children's sleep by
compelling them to rise early for farm "chores," or in order to sell
papers, or for other "useful" purposes.

[Sidenote: Eating before Retiring]

One's best sleep is with the stomach empty. It is true that food puts
one to sleep at first, by diverting blood from the head; but it disturbs
sleep later. Water, unless it induces bladder-action during the night,
or even fruit, may be taken without injury before retiring. If one goes
to bed with an empty stomach, he can often get along well with six or
seven hours' sleep, but if he goes to bed soon after a hearty meal, he
usually needs from eight to ten hours' sleep.

[Sidenote: Place of Sleep]

It has already been pointed out that sleeping outdoors is more restful
than sleeping indoors.

[Sidenote: Pillows]

A pillow is not a necessity if one sleeps lying prone with one arm
extended above the head and the leg opposite drawn up. This sleeping
attitude can easily be reversed to the opposite side. It has one
advantage over pillow-sleeping, that of not tending to round shoulders.
This prone position is often used now for infants, but is seldom enjoyed
by adults.

[Sidenote: Type of Bed]

A modern "hard" bed is far preferable to the old-fashioned soft (and
hot) feather bed.

[Sidenote: Character of Thoughts]

The character of sleep depends largely on the mental attitude on going
to bed. One should get into the habit of absolutely dropping work and
cares