I wake every time. For now.
My 3rd old wakes me too. He is sensitive to it as I had a few in pregnancy.
Some do get a resistance to hypos but I think its mainly due to your body experiencing a lot of low sugars so the body thinks its normal. I don't think it can be found once lost.
I take a med for blood pressure which disguises the symptoms but I'm experiencing the odd hypo after christmas indulgence.
Glucose tablets are good, I need 3 to sort out my hypos. After taking them you retest your sugar 2 hours later to check in range.
A hypo is a very shaky, prickily sweaty and disconcerting feeling. Your disoriented and sometimes I hear as if underwater. Well that's how I feel. It goes quickly on taking glucose.