2Johns MW. Sensitiity and specificity of the multiple sleep latency test (MSLT), the Maintenance of wakefulnsee test and the epworth sleepiness scale: failure of the MSLT as a gold standard. J Sleep Res, 2000,9:5-11.
3Barbar SI, Enright PL, Boyle P, et al. Sleep disturbance and their correlates in eldery Japanses American men Residing in Hawail. J Gerontol A Biol Sci Med Sci, 2000,55:M406-411.
4Hays JC, Blazer DG, Foley DJ. Risk of napping: excessive daytime sleepiness and mortality in an older community population. J Am Geriatr Soc, 1996,44:692-698.
5Liu X, Uchiyama M, Kim K,et al. Sleep loss and daytime sleepiness in the general adult population of Japan. Psychiatry Res, 2000 :14:1-11.
6Schmitt FA, Phillips BA, Cook YR, et al. Self report on sleep symptoms in older adults: correlates of daytime sleepiness and health. Sleep, 1996,19:59-64.
2Roberts RE, Shema S J, Kaplan GA, et al. Sleep complaints and depress sion in an aging cohort :a prospective perspective [J ]. Am J Psychiatry 2000,157 ( 1 ) :81-88.
3Birhdz G, Gibson JM, Clements PT. Dyingpatients' thoughts of ending their lives : a pilotstudy of rural New Mexico [J ]. J Psychosoc Nurs Ment Health Serv, 2004,42 ( 8 ) : 34-44.
6Wang J, Zhao X. Empty nest syndrome in China [J].Int J Soc Psychiatry,2012,58( 1 ): 110.
7Van Manen M. Researching lived experience: human science for an action sensitive pedagogy[J]. 3rd ed. Ontario: University of Western Ontario,2004:42-52.
8Britten N. Qualitative research:Qualitative intervise in medical research [J]. BMJ, 1995, 311:251-253.
9Nancy B, Susan KG. The practice of nursing research [M]. 3rd ed. [s. l .]. w. B : Saunders Company, 1998: 542-547.
10S andberg JC, Grzywacz JG, Talton JW, et al. A Cross-Sectional Expl- oration of Excessive Daytime Sleepiness, Depression, and Musculos- keletal Pain among Migrant Farmworkers [J]. J Agromedicine,2012,1 7(1):70-80.