[单选题]罗爷爷,70岁,长期伴有睡眠障碍的表现,一直服用安眠药,最近服药后睡眠得不到较好的缓解,以下哪项属于引起老年人睡眠障碍的主要原因( )
A.每天按时起床就餐(包括节假日)
B.午睡时间过久,超过1小时
C.因其长期服用安眠药,养成了习惯性和依赖性,发展成抗药性
D.入睡前喜欢阅读书报和杂志
E.睡前可以做身体放松的一些活动,如按摩、推拿、静坐等

The standardized educational or psychological tests that are widely used to aid in selecting, classifying, assigning, or promoting students, employees, and military personnel have been the target of recent attacks in books, magazines, the daily press, and even in Congress. 61) The target is wrong, for in attacking the tests, critics divert attention from the fault that lies with ill-informed or incompetent users. The tests themselves are merely tools, with characteristics that can be measured with reasonable precision under specified conditions. Whether the results will be valuable, meaningless, or even misleading depends partly upon the tool itself but largely upon the user.
All informed predictions of future performance are based upon some knowledge of relevant past performance: school grades, research productivity, sales records, or whatever is appropriate. 62) How well the predictions will be validated by later performance depends upon the amount, reliabilit