RecruitingPhase 1NCT07167316

The Role of the LC-NA System in Experimental Sleep Fragmentation

Phase I, Randomized, Placebo-Controlled Study on the Role of the LC-NA System in Experimental Sleep Fragmentation With Buccal Dexmedetomidine.


Sponsor

Hans-Peter Landolt

Enrollment

42 participants

Start Date

May 21, 2026

Study Type

INTERVENTIONAL

Conditions

Summary

Sleep-wake regulation affects every person's life, yet the molecular mechanisms underlying these processes remain poorly understood. In particular, the microstructure of sleep has not been sufficiently studied to explain how sleep produces a feeling of restoration the following morning. Stress also plays a significant role in sleep regulation. This study aims to investigate the role of norepinephrine in these processes.


Eligibility

Min Age: 18 YearsMax Age: 35 Years

Inclusion Criteria11

  • Age between 18 - 35 years (inclusive)
  • Body-Mass-Index (BMI): 18.5 < BMI < 25
  • Non-nicotine user status
  • Habitual consumption of 5 or fewer alcoholic beverages / week
  • Habitual consumption of 3 or fewer caffeinated beverages / day
  • Habitual average sleep duration 7-9 h / night
  • Normal or corrected-to-normal vision
  • Insomnia severity Index (ISI) Score: ISI < 8
  • Ability to understand and speak German language
  • Normal hearing ability (applies only to Sleep Study Part)
  • Ability and willingness to provide informed consent as documented by dated signature

Exclusion Criteria18

  • Present use of medication that may interfere with sleep or study drugs
  • Travel across 3 or more time zones within 3 months of study start
  • Habitual napping
  • Extreme chronotype, determined by reduced Morningness-Eveningness Questionnaire (rMEQ) score: 8 < rMEQ > 21)
  • Shift working within 2 weeks prior to the screening visit
  • History of or presence of a trauma- or stressor-related disorder
  • Serious acute or chronic neurological, mental, or general medical conditions that, in the opinion of the investigator, may pose a risk to participation or affect study measurements
  • History of or presence of a sleep wake disorder
  • Use of illicit drugs (positive urinary drug screening)
  • Male participants who are not vasectomised for at least 6 months prior to dosing and who are sexually active with a female partner of childbearing potential not willing to use one of the following acceptable contraceptive methods from the first dose and for 3 months after the last dose:
  • Use of condom and/or hormonal contraceptive (e.g., oral, patch, depot injection, implant, vaginal ring, intrauterine device) or non-hormonal intrauterine device used for at least 4 weeks prior to sexual intercourse for the female partner;
  • Male participants (including men who have had a vasectomy) with a pregnant partner not willing to use a condom from the first dose and for 3 months after the last dose.
  • Male participants not willing to abstain from sperm donation for 3 months after the last dose
  • Females of childbearing potential who are sexually active with a non-sterile male partner (sterile male partners are defined as men vasectomised at least 6 months prior to the first study drug administration) not willing to use one of the following acceptable contraceptive methods throughout the study and for at least 3 months after the last study drug administration:
  • Simultaneous use of condom and hormonal contraceptive (e.g., oral, patch, depot injection, implant, vaginal ring, intrauterine device) or non-hormonal intrauterine device used for at least 4 weeks prior to sexual intercourse for the female partner;
  • \- Females of non-childbearing potential who are neither: Post-menopausal (status defined as an absence of menses for at least 12 months prior to the first study drug administration); or Surgically sterilized (complete hysterectomy or bilateral oophorectomy at least 3 months prior to the first study drug administration)
  • Faints at the sight of blood (applies only for the pharmacokinetic-part of the study)
  • Has participated in a study < 30 days or a study such as this (i.e., experimental trauma) at all.

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Interventions

DRUGDMTN

Dexmedetomidine is a highly selective alpha-2 adrenergic receptor agonist that reduces the release of norepinephrine by inhibiting activity in the locus coeruleus, a key brain region involved in arousal and stress responses. In this study, dexmedetomidine will be administered as an oro-dispersible tablet applied buccally, allowing for rapid absorption through the oral mucosa.

OTHERAuditory Stimulation

Auditory tones will be presented throughout the night at individually calibrated intensities, adjusted to each participant's hearing threshold, in order to induce controlled sleep fragmentation without full awakenings.

DRUGPlacbo

Oro-dispersible placebo tablet identical in appearance and packaging to the active Dexmedetomidine tablet.


Locations(1)

University of Zurich, Institute of Pharmacology and Toxicology

Zurich, Switzerland

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NCT07167316