Maybe the therapist is asking to see if you have symptoms of sleep apnea. I also have sleep apnea, when you stop breathing during sleep, and the brain does not get enough oxygen, so you never get to the deepest part of sleep, the most restful part, and you don't dream, and you don't heal very much, either. I had a sleep study, and now i use a cpap oxygen breathing machine at night, and I can honestly say that an oxygenated brain is a happy brain.