http://scindeks-clanci.ceon.rs/data/pdf/0025-8105/2015/0025-...

...these symp- toms were most common in the group of mildly de- pressed, while the symptoms suggestive of disturbed
voluntary instinctive dynamisms (dream, sleep) as
well as the existence of somatic symptoms occurredin more severe forms of depression as it could be
expected. It seems that the depressed students from
the 2014 sample were prone to one general anhedonia, that is apathy, they did not have adequate mechanisms to fight stress...

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Note added at 14 hrs (2017-10-26 09:14:59 GMT)
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voluntary instinctive dynamism