My boyfriend doesn't work and has been sleeping through the day for the last year. At first, I thought it was his way of coping with his depression and didn't kick up a fuss.
Now, whenever I ask (plead... nag... joke... etc etc) him to come to bed at a normal hour so he'll get up in the morning and we can do things together, he just shrugs and says he'll try, but it never happens.
I end up having to do everything without him at the weekends. When I'm working, he just sleeps until I come home, so none of the household jobs are done.
He says things like 'It never used to be a problem' to excuse it and I don't know any other way to get my point across.