Sleep loss linked to psychiatric disorders

These images show how the emotional part of the brain (amygdala) is much more active when deprived of sleep. Top brain images show the response of the amygdala, circled in green, for study participants who viewed negative images after a normal night of sleep. Brain images below show the amygdala, circled in red, for participants who viewed negative images after 35 hours of no sleep. (Courtesy Matthew Walker/UC Berkeley)