To the Editor: Arousal disorder (AD) is the term used to describe undesirable behaviors occurring as a result of abnormal transition between wakefulness and nonrapid eye movement (NREM) sleep. AD includes sleepwalking, sleep talking, confusional arousals, and sleep terrors. Psychological factors have been associated with certain Ads,1,2 and comorbid mood disorders have been described with sleep terrors and sleepwalking.2 Our aim was to pragmatically determine the prevalence of anxiety and depression in a population of AD patients attending a tertiary-referral sleep clinic by using a questionnaire audit. Specific consent was considered unnecessary by the local research ethics committee.