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How will he ever be able to safely live by himself?
My husband is an active duty military officer, and so when he travels I am alone. I have worked out a system so that my sister has my phone number and an emergency number of someone who has a key to our place. I send a brief "I am OK" e-mail every morning when I am alone. She is instructed to call me if she doesn't see this e-mail by a certain time. If she gets no answer, she is to call the emergency person. It involves very little from either of us, but is a safety net that is comforting to both of us.
One more thing... I keep not one, but TWO 6-oz pop-top cans of apple juice on my nightstand by my bed. If I stir during the night, I can simply roll over and open one and drink it for 22 carbs. This is more likely for me to be able to accomplish than if I had to get up and go to the kitchen, for we feel extremely fatigued when low and are likely to simply go back to sleep if the "fix" is not right there by us.
But seriously, if he uses Lantus, you may want to talk to his doctor about splitting the dose or taking it all in the morning. Many folks who take Lantus at night find that its peak action in about 4 hours makes them prone to night lows.