I don't necessarily use the magnesium but sometimes do (or just chew a Tum) but if I have trouble staying asleep or wake in pain and have to get up for a bit until it settles; I'll often eat a bowl of cereal or carton of yogurt (the milk :-) I eat smaller amounts every so often during the day and not eating at night can sometimes trip me up such that eating something at night, too, will soothe me and let me get better sleep for another 3-5 hours.