Symptoms of major depressive disorder include problems of sleep, interest, guilt, energy, concentration, appetite, psychomotor symptoms, and suicidal thoughts. Five symptoms of the criteria are needed to make a diagnosis. Commonly in depressive illness you see a lot of anxiety and a loss of libido(erectile dysfunction).
Another important point is what happens to REM sleep during a major depressive episode. REM increases; REM density increases. You are in REM quicker and you are in REM longer when you are depressed. Most antidepressants will decrease REM sleep. An old trick back before there were good antidepressants, a thing you could do for refractory patients was keep them up all night. You would just sleep deprive them and the depression would get better. Because depressed people are spending too much time in REM. But it really didn’t work. They would relapse fairly quickly after being kept awake.
When people get depressed, or manic, they can get psychotic. A thirty-five-year-old housewife comes in says the devil is punishing me. She’s not interested in doing anything anymore. She is sleeping two hours a night. She says she can’t get to sleep. She has a lot of psychomotor retardation, what’s going on? She doesn’t have schizophrenia. She has major depressive illness. When people get too high or too low they can get psychotic. But not everybody who is delusional or hallucinating is schizophrenic.
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