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 psychiatrist treats mood disorders, such as anxiety and depression, which can contribute to sleep problems. Psychiatrists may conduct therapy and prescribe medication to relieve symptoms.  A psychologist provides psychotherapy to treat mood disorders that can interfere with sleep.
A number of different types of doctors can treat mental illness, including the following: 1  Primary care doctors: In many cases, your primary care doctor may diagnose and treat your mental illness. When necessary, the primary care doctor will refer you to a specialist.