Could try a chin strap: Amazon.com

I have the same problem with my mouth opening randomly at night and yet I still try to breathe through my nose which wakes me up.

In addition to proper sleep hygiene I tried Melatonin 300 mcg slow release, Magnesium Glycinate 1 (weekends) -2 (weekdays) capsules of 240 mg) and Gly-NAC at bedtime. It seems to work unless I had caffeine in late afternoon or got worked up too late in the evening.

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I constructed something similar to your sock. I used a knee high sock, filled it with rice and secured it with knots on each side. It’s 10” long and fits perfectly on the back of my neck to give me the right angle. Sometimes I put it in microwave to warm. It’s very relaxing especially if you mix rice with dry lavender.

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Very clever. Side sleeping definitely helps me a lot.