Day 3 and 4 of no contact

I haven't heard anything else from him yet.
I don't think he's yet figured out that I'm not responding.  It's not unusual for me to be crazy busy working 10, 12, and 14 hour days.  
Part of me is tempted to tell him "I'm sorry it was a bad night.  Hope you're ok."  But the other part of me wants to continue to practice NC.  I'm sure he will email me about this weekend.  Or first maybe he'll ask "are you ok?" or something like that.  I guess we'll see.