Heraclitus wrote:

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 deaf;

to them the adage applies

that whenever they are present

they are absent.

One should not act or speak

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.