Want to ask husband for space

I've come to the realization im just not a happy person anymore. I dont want to bring anyone down around me. I want to sleep by myself, basically we would still have to cohabitate but I just want him to do his thing and me to do my own thing. We have 2 small children. Has anyone else done this before? Did the space help you to get better/feel better? How did your so take it?