Bd'ing after midnight, do you count the actual day or previous day?

Julie • Mama to a sweet baby boy
I know the obvious answer is that whatever "day" it is when you bd it should count that day, but I've read some people count back to the previous day. Their logic or reasoning rather is that anything before sleep is the previous day anything after sleep is the current day. I just more wonder what everyone else think or the method you all use.