Okay, this is a weird one to me. To reduce depression, take a cold shower. Really. It's backed up by research, found here. Here's an excerpt: Exposure to cold is known to activate the sympathetic nervous system and increase the blood level of beta-endorphin and noradrenaline and to increase synaptic release of noradrenaline in the brain as well. Additionally, due to the high density of cold receptors in the skin, a cold shower is expected to send an overwhelming amount of electrical impulses from peripheral nerve endings to the brain, which could result in an anti-depressive effect. To see other benefits of cold showers (besides the one you always hear about) read this article.