In the primary repression phase, 'it is highly probable that the immediate precipitating causes of primal repressions are quantitative factors such as...the earliest outbreaks of anxiety, which are of a very intense kind'.
1 A neurologist treats brain and nervous system disorders that may contribute to sleep problems.  An otolaryngologist treats ear, nose, and throat conditions. This doctor may evaluate snoring and other breathing problems associated with sleep disorders.
Doctors diagnose sleep apnea based on medical and family histories, a physical exam, and sleep study results. Your primary care doctor may evaluate your symptoms first. He or she will then decide whether you need to see a sleep specialist.