Persistent disorder of initiating or maintaining wakefulness

http://linkedlifedata.com/resource/umls/relation/R28747956, http://linkedlifedata.com/resource/umls/relation/R54740103, http://linkedlifedata.com/resource/umls/relation/R03231702, http://linkedlifedata.com/resource/umls/relation/R70896644, http://linkedlifedata.com/resource/umls/relation/R70932346, http://linkedlifedata.com/resource/umls/relation/R31912142, http://linkedlifedata.com/resource/umls/relation/R70822384, http://linkedlifedata.com/resource/umls/relation/R70848244, http://linkedlifedata.com/resource/umls/relation/R111702336, http://linkedlifedata.com/resource/umls/relation/R111717885, http://linkedlifedata.com/resource/umls/relation/R70853734, http://linkedlifedata.com/resource/umls/relation/R70856299, http://linkedlifedata.com/resource/umls/relation/R70940492, http://linkedlifedata.com/resource/umls/relation/R03238693, http://linkedlifedata.com/resource/umls/relation/R70949258, http://linkedlifedata.com/resource/umls/relation/R54753888, http://linkedlifedata.com/resource/umls/relation/R70857107, http://linkedlifedata.com/resource/umls/relation/R111894921, http://linkedlifedata.com/resource/umls/relation/R111896077, http://linkedlifedata.com/resource/umls/relation/R54748224, http://linkedlifedata.com/resource/umls/relation/R40893618, http://linkedlifedata.com/resource/umls/relation/R54748225, http://linkedlifedata.com/resource/umls/relation/R40893620, http://linkedlifedata.com/resource/umls/relation/R54748226, http://linkedlifedata.com/resource/umls/relation/R40893622, http://linkedlifedata.com/resource/umls/relation/R70782690