I have Obstructive Sleep Apnea, and am now experiencing Insomnia, where I wake up around 2:00 AM, and can't get back to sleep. This has been going on for 8 weeks.
I want to get a second opinion from a sleep specialist. My question is, should I go to someone in Neurology or Pulmonary Medicine? What is the difference, as far as Sleep Disorders go?


The place to start is with your original sleep doctor, the sleep physician treating your osa.
For a 2nd opinion, it would be best to go to a sleep physician who was also a psychiatrist. If such a doctor isn't available, I would recommend a neurologist/sleep doctor.