Does Showering in the Dark Lower Your Cortisol?

TikTokers seem to be perpetually posting about their cortisol levels, which has recent led to a new trend: “Just discovered showering in the dark… life-changing,” reads one TikTok video caption. “You have to shower in complete, pitch-black dark,” says another user.

‘Dark showering’ is having a moment. Best enjoyed as a way of winding down in the evening, it entails opting for low lighting (including, in some cases, with an old-school lava lamp) and running the water cold enough…