If today was an identical day to yesterday, then the overnight drop in bg should be about the same. By identical, I mean same food, same exercise, same stress levels, same health - all of which are unlikely. However, if you take the same basal dose tonight starting from a lower bg you are risking a night time hypo, this is dangerous, please don't.
Talk to your diabetes team about how to adjust your basal/bolus levels safely.
The human body is what I would call a chaotic system, you can provide exactly the same circumstances twice (bg, food, exercise,etc.), and still get different results.