I'm staying with them while on bedrest from the nastiest mono infection I've ever witnessed, but once I'm recovered I still have my own place I can get back to
I also stay the night regularly when my dad needs to leave my mom home alone for travel because she's old and has old people problems
I'm in a pretty unique situation with how my life in relation to theirs turned out though so probably not a median example of a person who crashes with their parents for occasions outside of celebrations or family trips.