Sutra: Mindful among the mindless, Awake while others dream, Swift as the race horse He outstrips the field. ~The Dhammapada of Gautama the Buddha, CA. 500BC~
That is the difference between a buddha and others. Others are only dreaming, not really living, hoping to live some day, preparing to live, but not living. And that day never comes -- before that day comes, death.
A buddha is awake. Even while he is asleep he does not dream. When desires disappear, dreams disappear too. Dreams are desires translated into the language of sleep. A buddha sleeps with absolute alertness. The light goes on burning within him. The body needs rest, hence the body sleeps, but he needs no rest -- the energy is inexhaustible.
There at the center of his being, a small light goes on burning. The whole circumference is fast asleep but that light is alert, awake. We are asleep even while we are awake; he is awake even when he is asleep.