I often sleep through my Dex alarming for high or low and then wake up only to find I've been at 15 mmol/L or, worse, 3 mmol/L for the past five hours. I've worn a fitbit for years and use its silent vibrating alarm on my wrist to wake me up each morning, and I never sleep through that. I like to keep my Dex on vibrate during the day, but I've started to set it to one of the loud audible profiles in an attempt to not sleep through it, which gets annoying during the day. Plus, I still manage to roll over and ignore the Dex if it alarms and I don't feel like getting up to check it.
I just came across this product called a SpiBand which is like a mini version of the SpiBelt. It goes around your wrist and holds small objects like keys or cards. I decided to order one to wear while I sleep and put my Dex receiver in there, so that I can keep it on my wirst and keep the Dex on vibrate, but still wake to its alarms.
I haven't tried it yet, so I don't know for sure that it will work, but I think it will. And if it doesn't, it's only $10 and I could use it to hold Rockets (US: Smarties) during exercise.