Studies have found that a single night of inadequate sleep in people who have existing hypertension can cause elevated blood pressure throughout the following day. But this is <em>not </em>the cause of cardiovascular disease.
What causes narcissism?
Although the cause of narcissistic personality disorder isn't known, some researchers think that in biologically vulnerable children, parenting styles that are overprotective or neglectful may have an impact. Genetics and neurobiology also may play a role in development of narcissistic personality disorder.
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