Heraclitus says:

Men are as forgetful and heedless in their waking moments of what is going on around them as they are during their sleep. Fools, although they hear, are like the deaf; to them adage applies that whatever they are present they are absent. One should NOT act or spreak as if he were asleep. The waking have one world in common; sleepers have each a private world of his own. Whatever we see when awake is death, when asleep, dreams.