Sleep, Death and Dreams

1. In Greek mythology Sleep (Hypnos), Death (Thanatos), and Dreams (Oniros) were children of the goddess Night (Nyx)
2. Neglect or Forgetfulness (Lethe) and Pain (Algos) were grandchildren of the Night (Nyx). (Source: Ture et al., The art of alleviating pain in Greek mythology, (Neurosurgery, 56:178-185, 2005.)