The second fact with regard to yielding, instead of resisting, in order to get to sleep is that listening alone, apart from rhythm, tends to make one sleepy, and this leads us at once to the third fact, that getting to sleep is nothing but a healthy form of concentration.

If true concentration is dropping everything that interferes with fixing our attention upon some wholesome object, it means merely bringing the brain into a normal state which induces sleep when sleep is needed.  First we drop everything that interferes with the one simple subject, and then we drop that, and are unconscious.

Of course it may take some time to make ourselves willing to submit to an unusual noise if we have the habit of feeling that we must necessarily be disturbed by it, and, if we can stop the noise, it is better to stop it than to give ourselves unnecessary tasks in non-resistance.

Then again, if we are overtired, our brains are sometimes so sensitive that the effect of any noise is like that of being struck in a sore spot, and then it is much more difficult to bear it, and we can only make the suffering a little less by yielding and being willing that it should go on.  I cannot go to sleep while some one is knocking my lame arm, nor can I go to sleep while a noise is hitting my tired brain; but in such cases we can give up expecting to go to sleep, and get a great deal of rest by using our wills steadily not to resist; and sometimes, even then, sleep will come upon us unexpectedly.

With regard to the use of the will, perhaps the most dangerous pitfall to be avoided is the use of drugs.  It is not too much to say that they never should be used at all for cases of pure sleeplessness, for with time their power to bring sleep gradually becomes exhausted, and then the patient finds himself worse off than before, for the reactionary effect of the drugs leaves him with exhausted nerves and a weakened will.  All the strengthening, moral effect which can be gained from overcoming sleeplessness in wholesome ways is lost by a recourse to drugs, and character is weakened instead of strengthened.

When one has been in the habit of sleeping in the city, where the noise of the street is incessant, a change to the perfect silence of the country will often keep sleep off quite as persistently as noise.  So with a man who has been in the habit of sleeping under other abnormal conditions, the change to normal conditions will sometimes keep him awake until he has adjusted himself to them, and it is not uncommon for people to be so abnormal that they resist rhythm itself, such as is heard in the rolling of the sea, or the rushing of a river.

The re-adjustment from abnormal to normal conditions of sleeping may be made surely if we set about it with a will, for we have all nature on our side.  Silence is orderly for the night’s rest, and rhythm only emphasizes and enhances the silence, when it is the rhythm of nature.