Falling asleep
Crossing from waking into sleep — the loosening of guard when the day's watch ends.
Falling asleep in a dream is the dream's image of the loosening of guard when the day's watch ends. The fall is not failure; it is the cooperation of the body with the night. The dream brings the action when a holding posture in your life — vigilance, performance, the maintained alertness of a difficult period — is finally being released. Falling asleep in a safe place is the dream telling you the release is well-timed and appropriate. Falling asleep at a post where you are still meant to be watching is the dream noting that the loosening has come too soon, and the thing you were guarding is now exposed.