Yikes! I'd assumed you might reach toxicity before running out of digits! If you post the "share" link from the notebook I'll take a look. Or feel free to email me, my address is in my profile.
Once: you might expect restful sleep after 5am Twice: you might expect restful sleep after 6am Three: you might expect restful sleep after 12am
But 12am (midnight) is before 5am :-), so I assume it overflowed, or it means 12pm (the following day).