I believe my mother?s side have some psychological issues. My mother has depression and her sisters also have the same issue and all have difficulty sleeping without the aid of sleeping pills. My mother?s brother also had depression issues and unfortunately committed suicide due to that more than an year ago.
I do not have any sleep issues or depression issues like my mother and her family but do get depression when in POIS alone. If POIS has any genetic connection or not I don?t know but would be interesting to research.