<prompt> Narcolepsy is due to abnormality in ?HypothalamusNeocoexCerebellumMedulla oblongata  <response>: Ans. A. HypothalamusNarcolepsy is unique in that those who suffer from it tyPicaly fall almost instantaneously into REM sleep.It is thought that narcolepsy is caused by a malfunctioning of the hypothalamus in brain. 