My partner is very understanding. We have a camper van and every week or two I go away on my own for a day or two by myself, have some space, and re-group. Sometimes I spend time in there just with it parked on the drive, it's a nice, safe, warm, enclosed space.
I spoke to someone recently who said that her neurodiverse partner has the spare room set up with a sofa bed/kettle/desk/TV, and disappears in there for a day or two fairly regularly.
I'm curious to know how other people manage their needs for space and how partners feel. Sometimes I feel like my partner has to accommodate me, and put my feelings first. I wish I didn't fee like that.