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