12401
Eplivanserin did not modify wakefulness and non - rapid eye movement sleep ( NREMS ) , while zolpidem ( 10 mg / kg po ) induced a marked increase in NREMS duration .
 Eplivanserin, zolpidem
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Eplivanserin, zolpidem