Sleep helps process emotions
Sadly, negative emotional dampening in a single sleep cycle is limited.<p>There's nothing more agonizing in the morning than the few seconds of half-consciousness where the memory of having lost a loved one is absent... only to have it all rush back in an instant. I hated this both when I split with my first serious partner, and when I lost my grandfather. Waking to a nightmare and wishing you were still asleep.