I have no idea, because in-between that I was pushing Fawn's arc as far as I could without needing to save Cassie AND I was spamming shifts at Roxie's. Plenty of sleeping being done there.
I just reloaded my save from then to see what was up. I completely forgot that my character was hungover and I had to walk around until it went away. Whoops XD
I started a new save just to test, and yeah it's after you sleep. Like I said I'd forgotten that in my original file my character was hungover and couldn't sleep yet lol