Truer words have never been spoken. That and planning out your day & thinking through problems in the shower.
Considering how much more productive these moments are for me than the bullshit I used to do on my phone and social media, it was an easy decision to make.
Doing any relatively rote act like washing dishes, walking places, etc can also give rise to them. Not having a device in your hand to constantly steal your attention really helps though.
Couldn’t the relaxation be a factor in generating shower thoughts?
I suspect that essentially none of our non-ancestors were predated in a hot spring, unlike walking etc, so there may be an environmental cue driven induced relaxation that doesn’t exist for many other activities.
I suspect it's just about getting the space to relax, which is why I frequently have thoughts when staring at the wall, or taking a walk, or washing dishes, or doing any other myriad activities which are relatively easy on brain processing.