What is the most probable reasofor some rich people to use a device to record their sleeppatterns<br>·They have trouble falling asleep. <br>·They want to get sufficient sleep.<br>·They are involved ia sleep research.<br>·They want to go to bed oregular hours.

What is the most probable reasofor some rich people to use a device to record their sleeppatterns
·They have trouble falling asleep.
·They want to get sufficient sleep.
·They are involved ia sleep research.
·They want to go to bed oregular hours.

出自：佳木斯大学语言治疗学

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