那些睡眠持续时间在正常范围但毫无睡意的病人就会通常抱怨为得了失眠症。
"Patients commonly complain of insomnia when their sleep durations are well within the range of people without sleep symptoms."
研究者测量了睡眠持续时间，干扰睡眠后，醒来次数以及睡醒后再入睡的问题。
The researchers measured sleep duration, trouble falling asleep, the number of wake-ups and problems going back to sleep if awakened.
另外，有关这些人每天的睡眠持续时间和睡觉时间的早晚也通过调查问卷获得。
In addition, information about the mens' daily sleep, including sleep duration and their usual bedtime, was obtained by a questionnaire.
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