Mark,
Thanks for the suggestion. I always thought about sleep disorder. You are right about sleep study. One night is not going to be much help. At least a week would be better. Besides that a new place with all the electrodes and some one watching itself makes it difficult to sleep for PCS folks.

Pulse oximeters sounds like a good idea. I ask my doctor next time. This reminds me when I was at the hospital 2 years ago for 3 days (late on set of PCS symptoms and actually that is when I felt like my world collapsed) they kept me waking up one night and moved to a different floor for better monitoring. When I asked they said my heart rate was going really low. To begin with my heart rate is always low and doctors ask me if I am an athelete ( and I am not). I used to do only basic exercise and try to be healthy.

With TBI/PCS seems like if we are unlucky it affects very many things and no one knows what is affecting what and we have to figure out ourselves. What a mess?