Impact of Suvorexant on Sympathetic Nerve Activity and Baroreflex Function in Chronic Insomnia

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  • sponsor
    Montana State University
Updated on 4 February 2022
body mass index
chronic insomnia


This study aims to evaluate the effect of Suvorexant on sympathetic nerve activity and baroreflex function in subject with chronic insomnia. The investigator's central hypothesis is that Suvorexant will reduce sympathetic nerve activity and improve baroreflex function when compared to placebo.


This study will utilize a randomized, double-blind, placebo-controlled experimental approach to determine the effects of 8-wk treatment with Suvorexant (Belsomra) on sympathetic nerve activity and baroreflex function in male and female subjects with chronic insomnia. The study will utilize established techniques for assessing sleep (polysomnography), blood pressure (sphygmomanometer and beat-to-beat finger plethysmography), and peripheral sympathetic nerve activity (microneurography). The study will stratify enrollment based upon both age and sex (i.e., male vs. female) because these two covariates are known to influence sympathetic nerve activity and baroreflex function.

Condition Chronic Insomnia
Treatment Placebo, Suvorexant
Clinical Study IdentifierNCT03768713
SponsorMontana State University
Last Modified on4 February 2022


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Inclusion Criteria

Minimum 3 months of clinically diagnosed insomnia
Body mass index 35 kg/m2
Insomnia Severity Index (ISI) > 7 arbitrary units (i.e., mild-to-severe insomnia)
Pre-menopausal women must have regular menstrual cycles (~26-30 day cycles) and will be scheduled for microneurography 2-7 days after menstruation to consistently test during the early follicular phase (or low-hormone phase in women on contraceptives)

Exclusion Criteria

Current or prior treatment of Suvorexant
Obstructive sleep apnea defined as an apnea-hypopnea index > 30 using an FDA approved home sleep apnea screening devices as used in routine clinical practice
Participants without evidence of clinically significant obstructive sleep apnea on the screening test will undergo an overnight in-laboratory polysomnography to confirm absence of sleep apnea (apnea-hypopnea index of 30 episodes per hour) and to exclude other sleep disorders (e.g. periodic limb movement arousal index of 5 episodes per hour)
Circadian rhythm sleep disorders
History of meeting DSM-V criteria of major psychiatric disorder
Have been clinically-diagnosed with diabetes, cardiovascular disease, or any other unstable or serious medical condition
Current, or use within past month, of psychoactive (other than stable treatment with antidepressant or antianxiety), hypnotic, stimulant or analgesic medication (except occasional non-narcotic analgesics)
Shift work or other types of self-imposed irregular sleep schedules
Habitual smoking (6 or more cigarettes per week)
Habitual alcohol consumption (more than 2 alcoholic drinks per day)
Breastfeeding or pregnancy
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