My son asked if he could move back home for 3 months when he finished university. He said he would do his own washing and ironing and cook his own meals, and I said that was fine.
However, he was actually here for 9 months before he found a flat share, and although he was no trouble with looking after himself, he would obviously stay out late with his friends on many evenings and weekends, and I would automatically find myself waking up, noticing the landing light was still on and wondering if he was ok. I would tell myself that while he was at university I had had no idea what he was doing, but once he was back home I reverted to a worried mother.
And sometimes he would creep in very late and I would suddenly wake up with a jump to unexpected noises before remembering that I was no longer living alone. I have a number of health problems which give me sleep problems, so to have broken nights was difficult.
I hardly saw anything of him socially so I didn't have the benefit of his company, and although I was glad to help him out, I confess I was relieved when he had found somewhere else to live.