MACBETH:The innocent sleep,
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.

William Shakespeare (1564-1616) English dramatist and poet

Macbeth, Act 2, sc. 2, l. 48ff (2.2.48-52) (1606)
    (Source)