Leonardo da Vinci on sleep

Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.

Simplicity is the ultimate sophistication.

Anyone who invokes authors in discussion is not using his intelligence but his memory.

When I woke up this morning my girlfriend asked me, ‘Did you sleep well?’ I said ‘No, I made a few mistakes.’

Steven Wrightborn 1955

• Steven Wright

It is better to sleep on things beforehand than lie awake about them afterward.

Baltasar Gracián1601–1658

A few hours of mountain climbing turn a villain and a saint into two rather equal creature. Exhaustion is the shortest way to equality and fraternity, and liberty is added eventually by sleep.

Friedrich Nietzsche1844–1900