22691
RESULTS : During REMS rebound , the time spent in REMS and the number of MCH / Fos double - labeled neurons in the lateral hypothalamus increased markedly , and REMS latency showed a significant decrease .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None