“Lest I sleep death.” (13:4)
One should never tell a young child that someone who has died is just sleeping, unless you want to teach the child to fear bedtime. However, sleep is 1/60th of death, taught the rabbis of the Talmud (Berakhot 57b). In our unconscious state, we are closer to the world of souls. Not every dream is a message from beyond, but when the veil of our ego is lifted, we expand our ability to realize things about ourselves. Whether this expanded awareness comes from within our minds or from an outside agent is less important than our openness to hearing the message.