I honestly do not think it is a strange symptom. I think the bigger issue is more oriented toward what he is doing to further investigate it by experimenting, etc. I can tell you for certain, it is possible to sleep in a semi-sitting up position. I get some of my best sleep in a recliner chair. There are adjustable beds sold for similar needs, whether they are oriented to acid reflux or other positional problems.

Heightened hearing or other senses is a very common PCS symptom. Add this to any unresolved neck trauma and you have an annoying problem.

btw, He can participate as a guest on NeuroTalk. He will just have fewer privileges.