I'm glad you were able to take it easy this time and not let his drinking keep you up all night. Does it bother you that he's been lying to you about it? This wondering whether to trust your gut has been pretty exhausting for you on other nights and the subject of a few of your posts recently. I imagine it must be hard to trust him at this point.
I do think it's possible to rise above the worry to some extent, but it might also be a good idea to know what your bottom line is. He's been back a month, and has been drinking and lying to you, it sounds like, the entire time? Are you willing to continue with him drinking indefinitely and just try to hang out with him when he's sober--or really in the case of last night, maybe nursing a hangover? Or do you feel like you will need to set more boundaries at some point?