There is plenty of time to sleep in the grave.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

The serpent, the king, the tiger, the stinging wasp, the small child, the dog owned by other people, and the fool: these seven ought not to be awakened from sleep.

Six hours sleep for a man, seven for a woman and eight for a fool.

O sleepers! what a thing is slumber! Sleep resembles death. Ah, why then dost thou not work in such wise as that after death thou mayst retain a resemblance to perfect life, when, during life, thou art in sleep so like to the hapless dead?

Never go to sleep without a request to your subconscious.