Scott examines the relationship between sleep, synaptic homeostasis, and depression, exploring how sleep deprivation temporarily alleviates depression symptoms. Longer summary

Scott Alexander discusses a phenomenon where sleep deprivation temporarily alleviates depression, and explores the potential connection between sleep, synaptic homeostasis, and depression. He reviews the synaptic homeostasis hypothesis of sleep, which suggests that sleep helps renormalize synaptic connections, and connects this to research indicating that depression involves a deficit of synapses. The post then delves into various subtopics related to this theory, including the roles of REM and non-REM sleep, the effects of TMS and electroconvulsive therapy, and potential connections to circadian rhythms and bipolar disorder. Shorter summary