I can think of two ways to find out.
One is to set an alarm, go to sleep as normal but then test when the alarm wakes you. If not back to baseline you could test again later, but you wouldn't have slept continuously, so instead you'd have to do similar the next night but set the alarm a bit later. But the next night your body may not react the same, part of the frustration of diabetes is the variations even if you try to do exactly the same food, activity and meds.
The other is to get a 72-hour continuous monitor and see what happens on 3 successive nights while you're asleep. But the sensors for these are really expensive so I doubt you'd be given one just for curiosity. If you were concerned about sleeping through hypos that would be a different matter.