Because they became anxious about being able to fall asleep to the upbeat tune, all of their effort backfired, so that they would lie awake in frustration.

因为他们对自己能否在欢快的乐曲声中入睡感到焦虑，他们竭力想入睡，结果事与愿违，以致无奈地躺着，难以入眠。