What can be done to reduce the risk of getting a muscle spasm?

A couple of things you can do to reduce the risk of having a muscle spasm at night would be to stay hydrated during the day, and staying loose and stretched up before any activity. If you did have an activity where you may have injured a muscle or you overdid it, I would stay very well stretched out through the day, maybe stretch out at nighttime, and if you would happen to have a muscle cramp at night, rub out the muscle, try to stretch it out, get out of bed, and it should resolve pretty quickly.