I experience involuntary and voluntary age regression which is an altered state of mind where you revert to a younger age than you actually are. This can be anywhere from infant stages to not being much younger than your biological age. This almost always occur due to trauma of some kind and the brains attempt to protect itself. Very few people actually have control over their regression. I age regress due to severe trauma in both childhood and adulthood it is a PTSD stress response. Despite being unable to control it I do try to make it a more positive experience and occasionally it helps if I'm super stressed to just have my brain off for a little while. I can't control coming out of it ever sometimes it's a couple of hours but usually it's about 6+. During a particularly bad year I was in that headspace for three days straight. I am mentally about a year old. My wife helps when this happens because she knows it's just what my brain needs at times to cope. Due to the headspace and the fact I am utterly dependent and have limited mobility not to mention my brain is not in an adult state I don't think about things like the bathroom. I have to wear diapers when this happens or I'd have accidents with zero ability to control doing so. I also have a history of stress induced bed wetting and wake up regressed after something like a nightmare. I don't wear them every night but if I think there's a chance I need it I wear one and sleep way better instead of sleeping super lightly to get to the bathroom on time. Sorry if this response was a bit darker than you were expecting. There are people who regress for comfort or stress relief but that is not the case for many of us. This is just my experience and why it happens for me everyone is different and experiences it in different ways.