The darkest lullabies
In Greek mythology, Lethe was one of the five rivers of the Underworld, offering eternal forgetfulness to those who drank from its water. Lethe, or oblivion, often viewed as an equivalent to death itself, brings relief from the burden of memory - however, one does not have to die in order to forget; and voluntarily choosing oblivion over the pain of memories could be a way to cope with grief, or even with the less weighty troubles of everyday. This is not necessarily a foolproof solution, though...