2Soldatos CR,Allaert FA,OhtaT,et al.How do individuals sleep around the world Results from a single-day survey in tern coun- tries.Sleep Med, 2005,6 : 5-13.
3Morin CM,Morin CM,LeBlane M,et al.The economic burden ofin- somnia:diect and indirect costs for individuals with insomnia syn- drome, insomnia symptoms, and good sleepers, sleep, 2009,32: 55-64.