First of all, I can’t recall knowing these were thing. So, this is interesting, and I may look into this more.
Second, with the awareness of Hypo and I guess Hyper, but I’ll respond with the Hypo, I think it obviously depends on the person, I know for me it depends, sometimes I’ll get a feeling at 80’s, or if I have a sudden drop but I’ll be like 115, other times I’ll be 30-40 something an have no idea. As Eric said, sometimes I will test and get a low reading an be like Really? lol, or I’ll go to test an not get symptoms until I see the low number them I’m like, crap. lol. An with sleeping, I have dropped pretty low, but always have a vision so to speak, or feeling of some sort, then I wake up usually sweating really bad. Always a battle, everyday, all the time.