That can happen even if you take care of yourself occassionally. It has to do with the bloodsugar level. If you are more active you can use up your calories and then still have the insulin which will continue to lower your bloodsugar. It is a balancing act and why most diabetics carry something with them to take care of the lows.
The first time it happened, I gave it the name “the Bed Spins.” I want to fall on my bed and hold on...