Is it time to call it quits?

My husband and i have been together for 11 years, married for 6. We have a 2.5 year old and a 3 month old. The last year or so, he’s so miserable. He’s fallen into a pattern of staying up until 2/3am and sleeping until late morning/ early afternoon. It’s a fight to get him to wake up, to do anything around the house, to partake in any sort of family time. He will get up right when the toddler is going down for his nap so he barely sees him, if at all. And then he will go to work. He gets home at bedtime, or after so Barry sees the toddler again. I have zero help from him for anything. I’m completely miserable. I’ve tried to talking to him. He either says he’s going to change, doesn’t. Says he’s in funk and needs to snap out of it, doesn’t. Or he gets mad at me for “nagging”. Beside the obvious that he’s a lazy pos, it’s sickening to me he doesn’t want to spend time with his babies. They’re only young for so long. I just don’t get it. The sight of him literally makes me ill. I don’t know how to come back from this.

When he is around and present, he’s a fantastic father and our son adores him. But, this is not the man I married and I don’t know how to get through to him.

I’m heartbroken and confused and have no clue what to do.