FACTS ABOUT SLEEP.
Come sleep, O sleep! the certain knot of peace,
The baiting-place of wit, the balm of woe;
The poor man’s wealth, the prisoner’s release,
The impartial judge between the high and low.
Sir Philip Sidney.
While I am asleep I have neither fear nor hope, neither trouble nor glory, and blessings on him who invented sleep, the mantle that covers all human thoughts; the food that appeases hunger; the drink that quenches thirst; the fire that warms cold; the cold that moderates heat; and lastly, the general coin that purchases all things; the balance and weight that makes the shepherd equal to the king, and the simple to the wise.—Sancho Panza.
Sir Philip Sidney calls sleep “the poor man’s wealth,” and, he might have added, it is every man’s health. Men have often, according to their own notions, attempted to limit or extend the hours of sleep. Thus, the “immortal Alfred” of England divided the day into three portions of eight hours each, assigning one for refreshment and the health of the body by sleep, diet, and exercise, another for business, and the third for study and devotion. Bishop Taylor considered three hours’, and Richard Baxter four hours’, sleep sufficient for any man.
“Nature requires five,
Custom gives seven,
Laziness takes nine,
And wickedness eleven.”
The error into which these and others have fallen arises not only from the fact that in this, as well as in other things, every man is a law to himself, but from the varying amount required in each individual case at different times, depending upon the amount of renovation required by the nervous and muscular systems. John Wesley, the distinguished founder of Methodism, who attained the age of eighty-eight, and who could command sleep on horseback, says very properly, in some curious remarks which he has left upon sleep, that no one measure will do for all, nor will the same amount of sleep suffice even for the same person at all times. A person debilitated by sickness requires more of “tired nature’s sweet restorer” than one in vigorous health. More sleep is also necessary when the strength and spirits are exhausted by hard labor or severe mental efforts. Whatever may be the case with some few persons, of a peculiar constitution, it is evident that health and vigor can scarcely be expected to continue long without six hours’ sleep in the four-and-twenty. Wesley adds that during his long life he never knew any individual who retained vigorous health for a whole year, with a less quantity of sleep than this.
It is said that women, in general, require more sleep than men. This is doubtful: it is certain, at least, that women endure protracted wakefulness better than men. The degree of muscular and mental exertion to which the male is accustomed would seem to indicate that a longer period of rest ought to be required by him to admit of the necessary restoration of excitability. In infancy and youth, where the animal functions are extremely active, the necessity for sleep is greatest; in mature age, where time is more valued and cares are more numerous, it is less indulged; whilst the aged may be affected in two opposite ways; they may be either in a state of almost constant somnolency, or their sleep may be short and light.
There are some remarkable cases on record of deviations from the customary amount of sleep, making a “bed shorter than for an ordinary man to stretch himself upon, and a covering narrower than he can wrap himself in,” capacious enough for persons of very active habits in their waking hours. Many persons have reached advanced age without ever having had more than one or two hours’ sleep out of the twenty-four. There is one case of a man who, throughout his whole life, never slept more than fifteen minutes at one time. General Pichegru informed Sir Gilbert Blane that, in the course of his active campaigns, he had for a whole year not more than one hour of sleep in the twenty-four hours. Frederick of Prussia and Napoleon, as a general thing, only devoted three or four hours to sleep.
One can scarcely conceive a more horrible mode of torture than the Chinese plan of condemning criminals to death by preventing sleep. The victim is kept awake by guards alternately stationed for the purpose. His sufferings last from twelve to twenty days, when death comes to his relief.
The influence of habit in promoting or preventing sleep is remarkable. Those accustomed to the tranquillity of rural districts are excessively annoyed by the din of the carriages on the paved thoroughfares of a large city. It is said, on the other hand, that those who live near the cataracts of the Nile cannot sleep at a distance from them, owing to their having become accustomed to the noise, the stimulus of which upon the ear they lack. Some persons can only sleep in the dark; we knew a woman who slept habitually with a candle burning in her bedroom, and who invariably awoke if the light went out. Some of the soldiers of Bonaparte’s army would sleep, after extreme fatigue and exhaustion, on the ground by the side of a twenty-four pounder which was constantly firing. Some boys slept from fatigue on board of Nelson’s ship, at the battle of the Nile. We have heard of a boiler-maker who could go to sleep in a boiler while the workmen were constantly hammering the rivets.
Sleep can persist with the exercise of certain muscles. Couriers on long journeys nap on horseback; and coachmen, on their boxes. Among the impressive incidents of Sir John Moore’s disastrous retreat to Corunna, in Spain, not the least striking is the recorded fact that many of his soldiers steadily pursued their march while fast asleep. Burdach, however, affirms that this is not uncommon among soldiers. Franklin slept nearly an hour swimming on his back. An acquaintance of Dr. D., travelling with a party in North Carolina, being greatly fatigued, was observed to be sound asleep in his saddle. His horse, being a better walker, went far in advance of the rest. On crossing a hill, they found him on the ground, snoring gently. His horse had fallen, as was evident from his bruised knees, and had thrown his rider on his head on a hard surface, without waking him.
Animals of the lower orders obey peculiar laws in regard to sleep. Fish are said to sleep soundly; and we are told by Aristotle that the tench may be taken in this state, if approached cautiously. Many birds and beasts of prey take their repose in the daytime. When kept in captivity, this habit undergoes a change,—which makes us doubt whether it was not the result of necessity, which demanded that they should take advantage of the darkness, silence, and the unguarded state of their victims. In the menagerie at Paris, even the hyena sleeps at night, and is awake by day. They all, however, seek, as favoring the purpose, a certain degree of seclusion and shade, with the exception of the lion, who, Burdach informs us, sleeps at noonday, in the open plain; and the eagle and condor will poise themselves on the most elevated pinnacle of rock, in the clear blue atmosphere and dazzling sunlight. Birds, however, are furnished with a winking membrane, generally, to shelter the eye from light. Fish prefer to retire to sleep under the shadow of a rock or a woody bank. Of domestic animals, the horse seems to require least sleep; and that he usually takes in the erect posture.
Birds that roost in a sitting posture are furnished with a well-adapted mechanism, which keeps them firmly supported without voluntary or conscious action. The tendon of the claws is so arranged as to be tightened by their weight when the thighs are bent, thus contracting closely and grasping the bough or perch. In certain other animals which sleep erect, the articulations of the foot and knee are described by Dumeril as resembling the spring of a pocket-knife, which opens the instrument and serves to keep the blade in a line with the handle.
The following calculation is interesting. Suppose one boy aged ten years determines to rise at five o’clock all the year round. Another of the same age, indolent and fond of ease, rises at eight, or an average of eight, every morning. If they both live to be seventy years old, the one will have gained over the other, during the intervening period of sixty years, sixty-five thousand seven hundred and forty-five hours, which is equal to two thousand seven hundred and thirty-nine and a third days, or just seven and a half years. If a similar calculation were applied to the whole country, how many millions of years of individual usefulness would it prove to be lost to society!
“God bless the man who first invented sleep!”
So Sancho Panza said, and so say I!
And bless him, also, that he didn’t keep
His great discovery to himself, or try
To make it—as the lucky fellow might—
A close monopoly by “patent right!”
Yes—bless the man who first invented sleep,
(I really can’t avoid the iteration;)
But blast the man, with curses loud and deep,
Whate’er the rascal’s name, or age, or station,
Who first invented, and went round advising,
That artificial cut-off,—early rising!
“Rise with the lark, and with the lark to bed,”
Observes some solemn, sentimental owl:
Maxims like these are very cheaply said;
But ere you make yourself a fool or fowl,
Pray just inquire about their rise—and fall,
And whether larks have any beds at all!
The “time for honest folks to be abed”
Is in the morning, if I reason right:
And he who cannot keep his precious head
Upon his pillow till it’s fairly light,
And so enjoy his forty morning winks,
Is up—to knavery; or else—he drinks!
Thomson, who sung about the “Seasons,” said
It was a glorious thing to rise in season;
But then he said it—lying—in his bed
At ten o’clock A. M.,—the very reason
He wrote so charmingly. The simple fact is,
His preaching wasn’t sanctioned by his practice.
’Tis, doubtless, well to be sometimes awake,—
Awake to duty and awake to truth;
But when, alas! a nice review we take
Of our best deeds and days, we find, in sooth,
The hours that leave the slightest cause to weep
Are those we passed in childhood, or—asleep!
’Tis beautiful to leave the world a while
For the soft visions of the gentle night,
And free, at last, from mortal care or guile,
To live, as only in the angels’ sight,
In sleep’s sweet realms so cosily shut in,
Where, at the worst, we only dream of sin!
So let us sleep, and give the Maker praise.
I like the lad who, when his father thought
To clip his morning nap by hackneyed phrase
Of vagrant worm by early songster caught,
Cried, “Served him right!—it’s not at all surprising:
The worm was punished, sir, for early rising!”