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by lapsis_beeftech 1415 days ago
What might be going on here is that the UV induces radiation damage, which leads to endorphin release as part of the body's response to injury and pain. I have experienced this effect myself at times after getting a sunburn; the endorphins blocked the pain entirely and it was moderately euphoric. I know how dangerous sunburns are but if I was a rodent I would likely seek ways to repeat the experience.