According to the text, we can NOT infer that:
a) Changing some everyday habits can be a step to improve sleep quality.
b) A large number of peopl...
According to the text, we can NOT infer that:
a) Changing some everyday habits can be a step to improve sleep quality. b) A large number of people suffer from occasional sleepless nights. c) Difficulty in concentration can be a consequence of lack of sleep. d) Insomnia will necessarily lead to chronic sleepless nights.
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