Forehead Temperature-Regulating Therapy for Insomnia in Adults With Tourette's Disorder

Inclusion Criteria: * DSM-5 diagnosis of Tourette's disorder * DSM-5 diagnosis of Insomnia disorder * Yale Global Tic Severity Scale Score ≥ 14 for Tourette's disorder or ≥ 10 for persistent motor tic disorder or persistent vocal tic disorder * Insomnia Severity Index score \> 14 * Sleep efficiency ≤ 85 per cent on 50 percent or greater nights over monitoring week, per Consensus Sleep Diary * Age of 18 to 50 years * English fluency Exclusion Criteria: * Current or lifetime diagnosis of bipolar disorder, psychosis, or pervasive developmental disorder * Suicidality, severe depression or anxiety, or alcohol or substance dependence present within the past 6 months * Moderate to severe sleep apnea risk per score of ≥ 3 on the Stop-Bang Questionnaire * current diagnosis of Narcolepsy * Wechsler Abbreviated Scale for Intelligence-Second Edition IQ score \< 80 * Changes in prescribed or over-the-counter medications for sleep within prior month and planned during the study * Changes in tic or other psychotropic medication within prior month and planned during study * Caffeine use \> 3 cups per day * Behavior therapy for tics or sleep within prior 3 months * Travel across \> 2 time zones in prior month * Shift work, or irregular sleep schedule (i.e., nightly variation of \> 3 hours in bedtime or wake time, or time in bed duration \< 5.5 or \> 10 hours per night) * Raynaud's disease or severe cold sensitivity * Other major medical or neurological condition