tried a cold water swim, which I would not normally do

went with a friend to an outdoor lido last Saturday, mostly because she had been going on about it for months and I ran out of excuses. It was cold enough that I made a sound I have never made before. But then, something settled. My brain went very quiet for about twenty minutes after I got out, which almost never happens on a weekend when there is a list of things waiting. Slept well that night. The following two nights were ordinary, which is to say patchy and a bit restless. My friend says you have to go regularly for it to do anything. I am not sure I believe her but I also booked the next one, so.