Sleep Initiation and Maintenance DisordersAzabicyclo CompoundsSeverity of Illness IndexSleepHypnotics and SedativesVirginiaCognitive TherapyPolysomnographyQuestionnairesInsomnia, Fatal FamilialValerianSleep DisordersWakefulnessDreamsArousalSleep StagesDisorders of Excessive SomnolenceActigraphyComorbidityDyssomniasPrevalenceSleep Disorders, Circadian RhythmBenzodiazepines