Mark Twain picture from Appleton's Journal Jul...

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In the night, in the dark, the tragedy part was always to the front, and always warning, always threatening; and so I moaned and tossed, and sleep was hard to find. But in the cheerful daylight the tragedy element faded out and diappeared, and I walked on air, and was happy to giddiness, to intoxication, you may say.

–Mark Twain
The £1,000,000 Bank-Note

Sleep that knits up the raveled 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 in life’s feast.

— The rueful murderer in
Shakespeare’s Macbeth
Act II Scene 2