On one hand it's normal to have to go to bed early and not chat late. I am up for work and it's 5am so I wouldn't be chatting past 10pm, I actually was in bed at 9pm. He maybe has to get up early. Or it could be that he isn't interested beyond just talking. Is he asking personal questions like about things you like or your experiences? That usually is indication of some interest.

I don't believe you need to do anything to get someone to talk to you or ask you out. Just be yourself. On the other hand it's ok to directly ask what his interest is. Looking for a date? Just talking? If he doesn't communicate consistently and not asking you out then I'd probably move on. It's hard to tell though until you meet people what's really going on. He might not be that interesting irl.