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.
A neurology doctor might work with an athlete to determine if they received any brain damage from a sports injury. A neurology doctor specializes in the diagnosis and treatment of disorders affecting the brain, spinal cord, and nerves. A general practitioner often refers the patient to a specific neurology or practice.