As one has well said: "Refreshing sleep and vexing thoughts are deadly foes." Health and happiness often disappear from those who fail to sleep, for sleep, indeed, is "tired Nature's sweet restorer," as Young in his _Night Thoughts_ termed it.

Shakspere never wrote anything truer when he said: Sleep that knits up the ravell'd sleave of care, The death of each day's life, sore labor's bath, Balm of hurt minds, great Nature's second course, Chief nourisher of life's feast.
Or, where he spoke of it as Sleep that sometimes shuts up sorrow's eye, Steals me awhile from mine own company.
Even the Bible makes sleep one of the special blessings of God, for we are told that "He giveth His beloved sleep." The sacred book contains many references to sleeplessness and its causes.
Undoubtedly most potent among these causes is worry.

The worrier retires to his bed at the usual hour, but his brain is busy--it is working overtime.

What is it doing?
Is it thinking over things that are to be done, and planning for the future?
If so, there is a legitimate excuse, for as soon as the plan is laid, rest will come, and he will sleep.

Is he thinking over the mistakes of the past and sensibly and wisely taking counsel from them?
If so, he will speedily come to a decision, and then sleep will bring grateful oblivion.