Since you're staying up....
This post by Dr. Lisa may help you understanding "bouncing" (although she refers to it as 2 types of "rebound".)
One type is " unwarranted rebound"- when a cat sees numbers that are lower than what he's used to, but still safe and not really low numbers.
The other she calls "warranted rebound". That's when the number is actually low, and indicates a reduction in dose is probably needed.
The other really important thing she discusses is what she calls a " downward slant". Where the BG just seems to drop for twelve hours and gives you a much lower reading than the previous preshot number.
I think that point is even more important than the part about rebound. I have seen quite a few cats on PZI experience that in the past couple of weeks since I stared posting here again. And in just about every case, caregivers and advisors seem to think that this means that the dose was too high, and the cycle ran too long.
I could not possibly disagree more with that thinking. Neither does Dr. Lisa if you read her comments. Attempting to reduce a dose to prevent this from happening, and instead trying to get a "smile curve with two shootable numbers" causes a loss of momentum, and causes a cat to spend more hours per day in hyperglycemic numbers. It undoes "progress". IMHO, there is nothing more encouraging than seeing a cycle that lasts more than 12 hours, and that doesn't cause a climb back to a preshot number that matches the last preshot number. I think the " smile curve" is grossly overrated.
I'll climb off my soapbox now
But do read what Dr. Lisa has to say about rebound!
http://www.felinediabetes.com/FDMB/threads/new-day-after-yesterdays-hypo.58953/#post-642503