I read on another board about the danger of nighttime hypos being slightly overstated, and that it wasn't possible to actually "die" in your sleep from them. Really tried to track this link down for you but cant seem to find it unfortunately. Of course it's never good to hypo badly but trying to let you know that even if it happens your body has ways of coping.
From personal experience before I got off the rollercoaster of a high carb diet I would hypo often in my sleep, and I always woke up though it wasnt a particularly pleasant experience. (even after hard nights on the sauce
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Here is a blurb taken from another website:
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It seems to me that your main concern is that you're going to go too low whilst asleep and something bad will happen. Let me reassure you of something. The human body is an amazing thing and has the ability to respond to danger when faced with it. Low blood sugar is a danger - so your body has the ability to respond to it, even when you're asleep.
Most of the time, if you have a hypo at night, your brain will spring into action and wake you up. If you have low blood sugar, trust me, your brain is going to be the first to know about it and it's going to make sure that the rest of you is #2 on the list. So if that happens, you wake up, you realise you're having a hypo, and then you can do something about that.
Now, admittedly the human body isn't perfect. On (rare) occasions, your brain might not wake you up. However, even if you're asleep during a hypo, your brain isn't. Your brain never sleeps, and it's there constantly monitoring everything that's going on in your body. It's always flipping switches and pressing buttons to make sure that you're fine. Sadly, the switch that's marked 'insulin' doesn't work in you or me. However, the switch marked 'add sugar' works just fine.
When you have a hypo, your brain releases adrenaline, which is what causes the shaky, panicky feeling you might have when you have a hypo. This is your brain's way of telling your body to go find some food. However, if for some reason your body doesn't find any food (for instance, you're asleep), your brain releases glucogon into your blood. Glucogon is a hormone that tells your liver to start pumping out the glucose you've got stored in your liver.
Therefore, typically you aren't going to have a hypo in your sleep that is going to be really dangerous to you. Your body is geared up for low blood sugar whislt sleeping and can protect you from it. If you go low in your sleep then you'll still wake up the next morning, or perhaps even earlier. Keep a bottle of Lucozade near your bed - that way if you wake up, you've got some emergency sugar right next to you. Either way, you're going to be fine, although you'll probably feel like you've got a hangover the next morning if you have to liver-dump.
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Point I'm trying to get accross is that Hypoing is never good and try to avoid it as much as you can, but don't lose sleep over it ^_^