Mechanisms of Sleep Disruption Hyperalgesia
Condition: Sleep Deprivation; Pain
MeSH terms: Hyperalgesia; Sleep Deprivation
Study type: Interventional

Summary: 
      Twenty percent of Americans suffer from chronic pain. Sleep disturbance is similarly
      prevalent and among the most common and disabling neurobehavioral problems associated with
      chronic pain. This research is designed to evaluate the effects of disrupted sleep patterns
      on mood, inflammation, the perception of pain, and pain relief. This study will help
      researchers understand the relationship between sleep and pain, and how sleep disturbance
      might influence chronic pain conditions.
    

Detailed description: 
      This research is being conducted in order to evaluate the effects of disrupted sleep patterns
      on mood, inflammation, the perception of pain, and pain relief. This study will help
      researchers understand the relationship between sleep and pain, and how sleep disturbance
      might influence chronic pain conditions. Healthy participants will undergo baseline sleep and
      sleep disruption conditions. Following undisturbed sleep and sleep disruption conditions,
      sensitivity to pain and analgesic response (via morphine or placebo administration) will be
      assessed using a heat-capsaicin pain model.

      This study will be conducted in 2 major parts-3 screening visits (2 outpatient and 1
      inpatient) and 2 experimental inpatient visits. Part 1 of the study will involve a 1-week
      screening period. This will involve two separate screening visits lasting about 2 hours each.
      At Screening Visit 1, participants will complete questionnaires, an interview, and undergo
      toxicology screening. At Screening Visit 2, participants will complete questionnaires,
      undergo a physical exam, and be familiarized with pain testing procedures. At Screening Visit
      3, participants will undergo an inpatient sleep study.

      Part 2 will involve two different inpatient admissions. The two admissions will be separated
      by at least two weeks. During each of the admissions, participants' sleep will be studied at
      night. The first admission will begin immediately following the overnight sleep study in
      Screening Visit 3. One of the admissions will be for one night and the other admission will
      be for three nights. For the one night admission, participants will sleep undisturbed for an
      8-hour period. For the three night admission, participants will undergo sleep disruption for
      two nights in a row. On the third night, participants will be allowed to sleep undisturbed
      for 8 hours for recovery.

      During both inpatient admissions, pain testing procedures will be completed that will last
      approximately 5 hours during the day. During testing, small amounts of blood will be drawn
      for analysis. Participants will be randomly assigned to two groups. Group A will be given a
      standard dose of morphine during pain testing. Group B will be given a placebo during pain
      testing.
    

Intervention name(s): Morphine; Saline Placebo; Forced Awakenings; Uninterrupted Sleep
Intervention type(s): Drug; Drug; Behavioral; Behavioral
Intervention description(s): 0.08mg/kg will be administered to participants randomly assigned to receive the drug via IV bolus during each quantitative sensory testing session (after one night of uninterrupted sleep and after 2 nights of forced awakenings).; Saline Placebo will administered to participants randomly assigned to receive the placebo via IV bolus during each quantitative sensory testing session (after one night of uninterrupted sleep and after 2 nights of forced awakenings).; Participants will be awakened each hour during an 8 hour sleep opportunity period. One of the awakenings is for 60 minutes and randomly determined. The other 7 awakenings are for 20 minutes each, and are randomly scheduled to occur in either the first second or third tertile of each hour. The maximum total sleep time a participant will receive is 280 minutes.; Participants will receive an 8 hour period of undisturbed sleep
Intervention MeSH terms: Morphine
Allocation: Randomized
Intervention model: Crossover Assignment
Masking: Double (Participant, Care Provider)
Primary purpose: Basic Science