Mark Frauenfelder, writing at Boing Boing:

A recent study of sleep loss and depression found that one night of total sleep deprivation generally worsens mood and emotional regulation in healthy individuals, but induces a temporary lift in spirits for some individuals with depression. . . . The findings were remarkable: lack of sleep escalated negative mood among the healthy subjects, but eased depressive symptoms in 43% of the patients with depression.

Presented without comment. 😐

Here’s a link to the study itself. Let me know if any copies fall off the back of any trucks, because i don’t have access to PNAS.