sleep

"Macbeth does murder sleep, the innocent sleep,
Sleep that knits up the ravelled sleeve 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" (2.2.35-39).

Three things about sleep should be noted: (1) Sleep as the great interpreter of life; (2) Sleep as healer; and (3) Sleep as nourisher. Each calls for comment.