Thanks for your note of welcome. Kleine-Levin syndrome does not affect me or a close family member. In my 1993 publication "Abnormal fluctuations of acetylcholine and serotonin" (Medical Hypotheses vol. 40, pp. 309–310, I speculated that prolonged low levels of acetylcholine within the mammalian brain might be correlated with KLS symptoms. My speculations might be relevant to the Crick-Mitchison theory of REM sleep.