Timed sleep deprivation is a strategy to improve the mood of depressed patients.10 Because postpartum women face inevitable sleep deprivation, advice on timing of their evening sleep may be helpful. Parry et al.11 assigned 12 severely depressed women to sleep deprivation in the early night (sleep permitted from 3 to 7 a.m.) or late night (sleep permitted from 9 p.m. to 1 a.m.). Response was defined as a 50% reduction in baseline depression score or a Hamilton Rating Scale score of less than or equal to 8. They found that 82% of mothers responded to late night deprivation compared to 33% with early night sleep deprivation.