Non-alcoholic fatty liver disease and sleep disorders

Table 1 Correlations between non-alcoholic fatty liver disease and sleep disorders

Items		Correlations
Sleep	Sleep duration	Short sleep duration and long daytime naps are risk factors for NAFLD[19-22]
		Moderate sleep duration reduces the risk of NAFLD[23-26]
		Excessive sleep duration increases the risk of NAFLD[23,25,30,31]
	Sleep quality	Poor sleep quality was significantly associated with an increased risk of NAFLD[19,25]
Sleep disorders	Insomnia and daytime sleepiness	Increases the risk of NAFLD in participants with insomnia or daytime sleepiness[35,38,39]
	Sleep-wake disturbance	Raises the risk of NAFLD through obesity, IR, disorder of glucose-lipid metabolism and inflammation[40,42-45]

NAFLD: Non-alcoholic fatty liver disease; IR: Insulin resistance.