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.
Neurologists. A patient with insomnia may also be referred to a neurologist. A neurologist is a physician with in-depth training in nervous systems disorders. An imbalance in brain chemistry can bring on a host of negative symptoms that include insomnia. Neurologists also treat restless leg syndrome, a common cause of insomnia.