Objective: To assess the prevalence of insomnia
symptoms in patients with objectively diagnosed sleep-disordered
Design: Retrospective medical chart
review of a representative sample of patients with SDB.
Setting: University sleep-disorders clinic and
Patients: Two hundred thirty-one patients
with SDB were selected from a pool of approximately 2,000 patients with
Measurements: Data were extracted
from intake questionnaires and polysomnographic studies.
Results: Of 231 patients with SDB diagnoses, 115 patients
reported no insomnia complaints (SDB-only patients) and 116 patients
reported clinically meaningful insomnia complaints (SDB-plus patients).
Compared to SDB-only patients, SDB-plus patients reported significantly
worse mean sleep characteristics consistent with insomnia, including
sleep latency (17 min vs 65 min), total sleep time (7.2 h vs 5.6
h), and sleep efficiency (92% vs 75%). SDB-plus patients experienced
significantly more psychiatric disorders, cognitive-emotional symptoms,
and physical and mental symptoms that disrupted or prevented sleep.
SDB-plus patients also reported greater use of sedative and
psychotropic medications and had significantly more primary complaints
of insomnia, restless legs or leg jerks, and poor sleep quality despite
having relatively similar referral rates for sleep apnea or complaints
of loud snoring.
Conclusions: Problematic insomnia
symptoms were reported by 50% of a representative sample of patients
with objectively diagnosed SDB. Research is needed to determine the
degree to which insomnia and related symptoms and behaviors interfere
with SDB treatment.