1. International classification of sleep disorders;American Academy of Sleep Medicine,2005
2. Shift work basic principles;Monk,2000
3. Consequences of shiftworking on sleep duration, sleepiness, and sleep attacks;Ohayon;Chronobiol Int,2010
4. QuickStats: percentage of adults who reported an average of ≦6h of sleep per 24-hour period, by sex, age group-United States, 1985 and 2004;National Center for Health Statistics;Morb Mortal Wkly Rep,2005
5. The national time use survey 2005;Housou-Bunka-Kenkyujo,2006