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A 28-Day Polysomnographic Study of Gabapentin in Transient Insomnia Induced by a Sleep Phase Advance

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: September 13, 2005
Last Update Posted: April 24, 2008
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
The purpose of this study is to to assess the effect of gabapentin compared to placebo on sleep, using polysomnography along with subjective sleep assessments, in subjects with transient insomnia induced by a sleep phase advance.

Condition Intervention Phase
Transient Insomnia Drug: Gabapentin Drug: Placebo Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Placebo-Controlled, Multicenter, 28-Day, Polysomnographic Study of Gabapentin 250 mg in Transient Insomnia Induced by a Sleep Phase Advance

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Polysomnographic (PSG) measurement of Wake after Persistent Sleep Onset (WAPSO) [ Time Frame: Day 1 ]

Secondary Outcome Measures:
  • PSG WAPSO [ Time Frame: Day 28 ]
  • PSG Latency to Persistent Sleep (LPS) [ Time Frame: Days 1 and 28 ]
  • PSG Sleep Onset Latency (SOL) [ Time Frame: Days 1 and 28 ]
  • PSG Number of Awakenings (NAW) [ Time Frame: Days 1 and 28 ]
  • PSG Wake after Sleep Onset (WASO) [ Time Frame: Days 1 and 28 ]
  • PSG Total Wake Time (TWT) plus Stage 1 Sleep [ Time Frame: Days 1 and 28 ]
  • PSG Wake Time During Sleep (WTDS) [ Time Frame: Days 1 and 28 ]
  • PSG Total Sleep Time (TST) [ Time Frame: Days 1 and 28 ]
  • PSG Sleep Efficiency (SE) [ Time Frame: Days 1 and 28 ]
  • PSG Percent of Stages 1, 2, 3, 4 and REM sleep [ Time Frame: Days 1 and 28 ]
  • PSG Percent Slow Wave Sleep (SWS, Stages 3&4 combined) [ Time Frame: Days 1 and 28 ]
  • Subjective SL [ Time Frame: Days 1 and 28 ]
  • Subjective NA [ Time Frame: Days 1 and 28 ]
  • Subjective WASO [ Time Frame: Days 1 and 28 ]
  • Subjective TST [ Time Frame: Days 1 and 28 ]
  • Subjective ASR [ Time Frame: Days 1 and 28 ]
  • Subjective ASQ [ Time Frame: Days 1 and 28 ]
  • Karolinska Sleep Diary (KSD)-Sleep Quality Index [ Time Frame: Days 1 and 28 ]
  • KSD individual scores [ Time Frame: Days 1 and 28 ]
  • Vital signs [ Time Frame: Days 1 and 28 ]
  • Adverse events [ Time Frame: Through Day 32 ]

Enrollment: 256
Study Start Date: October 2005
Study Completion Date: April 2006
Arms Assigned Interventions
Experimental: Gabapentin Drug: Gabapentin
Gabapentin 250 mg oral capsule 30 minutes prior to bedtime for 28 days
Placebo Comparator: Placebo Drug: Placebo
Matched placebo 30 minutes prior to bedtime for 28 days


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • 18 years of age or older with occasional sleeplessness in the month prior to screening

Exclusion Criteria:

  • Current treatment for, or recent history (within 2 years) of, a sleeping disorder including excessive snoring, obstructive sleep apnea or a chronic painful condition that interferes with the subject's sleep
  • Currently taking or expected to take any of the following during trial: amphetamines, benzodiazepines, cocaine, marijuana, methaqualone, methadone, opiates, propoxyphene, barbiturates, and phencyclidine during their participation in the trial
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00163046

United States, California
Pfizer Investigational Site
Glendale, California, United States, 91206
Pfizer Investigational Site
San Diego, California, United States, 92123
United States, Kansas
Pfizer Investigational Site
Overland Park, Kansas, United States, 66212
Sponsors and Collaborators
Study Director: Pfizer CT.gov Call Center Pfizer
  More Information

Additional Information:
Responsible Party: Director, Clinical Trial Disclosure Group, Pfizer, Inc.
ClinicalTrials.gov Identifier: NCT00163046     History of Changes
Other Study ID Numbers: A9451155
First Submitted: September 8, 2005
First Posted: September 13, 2005
Last Update Posted: April 24, 2008
Last Verified: April 2008

Additional relevant MeSH terms:
Sleep Initiation and Maintenance Disorders
Sleep Disorders, Intrinsic
Sleep Wake Disorders
Nervous System Diseases
Mental Disorders
gamma-Aminobutyric Acid
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Antiparkinson Agents
Anti-Dyskinesia Agents
Calcium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Anti-Anxiety Agents
Tranquilizing Agents
Central Nervous System Depressants
Psychotropic Drugs
Excitatory Amino Acid Antagonists
Excitatory Amino Acid Agents
Neurotransmitter Agents
Antimanic Agents
GABA Agents