<prompt> Narcolepsy is due to abnormality in -HypothalamusNeocortexCerebellumMedullaoblongata  <response>: Ans. is a i.e., Hypothalamus o Narcolepsy is unique in that those who suffer from it typically fall almost instantaneously into REM sleep,o It is thought that narcolepsy is caused by a malfunctioning of the hypothalamus in brain. 