Cold showers can be a way to regain control through positive morning priming. I wrote this how-to a few years ago: https://medium.com/the-mission/a-year-of-cold-showers-662ec6...

Yes absolutely - cold showering is great in the same ways. There are plenty people out there who do this every day also. Personally I prefer a cold bath to a cold shower as I like the instant hit of more full immersion, but there's not always time for a bath!