Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

To investigate the impact of disorders of arousal and sleep disturbance on everyday living and participation in rehabilitation.', 'Survey of rehabilitation centres based on naturalistic observation.', 'One hundred and thirty-five adults with acquired brain injury were reported by rehabilitation staff in seven centres across the UK for presence of arousal and/or sleep disturbance, the impact on rehabilitation and daily living and treatment strategies in use.', 'Disturbance of arousal or sleep patterns was reported in 47% of the sample, with significant adverse effect on activity evident in two-thirds of such cases. Prevalence of disordered arousal was consistent over time for up to 10 years post-injury. Concurrent psychiatric illness, but not epilepsy, was associated with arousal and sleep disorder. Non-pharmacological interventions and benzodiazepine/hypnotic drugs were in use in 34% and 20% of cases respectively. In all cases of prescribed hypnotic drugs, period of use exceeded recommended UK guidelines.
Is rehabilitation compromised by arousal and sleep disorders : results of a survey of rehabilitation centres?