Oh sleep! It is a gentle thing,
Beloved from pole to pole.
Samuel Taylor Coleridge (1772 – 1834)

If you can’t sleep, then get up and do something instead of lying there and worrying. It’s the worry that gets you, not the loss of sleep.
Dale Carnegie

Laugh and the world laughs with you, snore and you sleep alone.
Anthony Burgess (1917 – 1993)

[Sleep is] the golden chain that ties health and our bodies together.
Thomas Dekker (1572 – 1632)