One word more about outside disturbances before we turn to those interior ones which are by far the most common preventatives of refreshing sleep. The reader will say: "How can I be willing that the noise should go on when I am not willing?" The answer is, "If you can see clearly that if you were willing, the noises would not interfere with your sleep, then you can find the ability within you to make yourself willing."
It is wonderful to realize the power we gain by compelling and controlling our desires or aversions through the intelligent use of the will, and it is easier to compel ourselves to do right against temptation than to force ourselves to do wrong against a true conviction. Indeed it is most difficult, if not impossible, to force ourselves to do wrong against a strong sense of right. Behind an our desires, aversions, and inclinations each one of us possesses a capacity for a higher will, the exercise of which, on the side of order and righteousness, brings into being the greatest power in human life. The power of character is always in harmony with the laws of truth and order, and although we must sometimes make a great effort of the will to do right against our inclinations the ease of such effort increases as the power of character increases, and strength of will grows steadily by use, because it receives its life from the eternal will and is finding its way to harmony with that.
It is the lower, selfish will that often keeps us awake by causing interior disturbances.
An actor may have a difficult part to play, and feel that a great deal depends upon his success. He stays awake with anxiety, and this anxiety is nothing but resistance to the possibility of failure. The first thing for him to do is to teach himself to be willing to fail. If he becomes willing to fail, then all his anxiety will go, and he will be able to sleep and get the rest and new life which he needs in order to play the part well. If he is willing to fail, then all the nervous force which before was being wasted in anxiety is set free for use in the exercise of his art.
Looking forward to what is going to happen on the next day, or within a few days, may cause so much anxiety as to keep us awake; but if we have a good, clear sense of the futility of resistance, whether our expected success or failure depends on ourselves or on others, we can compel ourselves to a quiet willingness which will make our brains quiet and receptive to restful sleep, and so enable us to wake with new power for whatever task or pleasure may lie before us.
Of course we are often kept awake by the sense of having done wrong. In such cases the first thing to do is to make a free acknowledgment to ourselves of the wrong we have done, and then to make up our minds to do the right thing at once. That, if the wrong done is not too serious, will put us to sleep; and if the next day we go about our work remembering the lesson we have learned, we probably will have little trouble in sleeping.
If Macbeth had had the truth and courage to tell Lady Macbeth that both he and she were wicked plotters and murderers, and that he intended, for his part, to stop being a scoundrel, and, if he had persisted in carrying out his good intentions, he would never have "murdered sleep."