Biz partner in California rang my phone here in Osaka at 6:37AM this morning, waking me up. I demure, text back, "Can I call you later? It's 6:37AM here."
No response.
Well, now I'm guessing he's having trouble with the project/code I pushed yesterday, though I tested it thoroughly. Sometimes he gets bent out of shape that I've missed something like a product number on a page, where I'd found 11 out of 12 instances (yes, oddly specific, I know). So now I'm fully awake and making coffee, I'll call him once I get some caffeine in me.
He writes back:

"We're all at Universal Studios."

…

"Did you butt-dial me? What's going on?"

"Oh, yeah. I guess I did. Did I wake you up?"

"Yes, it was 6AM. I was asleep."

"Guess I solved that problem for you! Ha!"

bought a replacement mic for my headset for gaming but that doesnt work either so it might be the cans. Ppl miss my heavy breathing 
