Clinical trial NCT00230737: Effects of Melatonin on Insomnia Symptoms in Older Adults
Official title: Melatonin Randomized Trial for Insomnia in the Elderly
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE2
Conditions: Sleep Initiation and Maintenance Disorders
Keywords: Aged
Sleep
Insomnia
Melatonin
Neurobehavioral Manifestations
Circadian Rhythms
Human
Polysomnography
Elderly
Lead sponsor: University of Pennsylvania
Sponsor class: OTHER
Collaborators: name: National Center for Complementary and Integrative Health (NCCIH)
First posted: 2005-10-03
Enrollment: 27
Sex: ALL
Minimum age (years): 65
Standard ages: OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: This study will determine whether melatonin tablets will increase the sleep of older adults with insomnia.

Detailed description: Melatonin is a hormone secreted predominantly during the sleep period, suspected to have a strong link to the circadian sleep-wake cycle. Melatonin is also available in a pill form and, when administered during the day, tends to have a sedative effect. Clinical trials that have examined the nocturnal effects of melatonin have focused on patients of any age who have insomnia, regardless of their endogenous melatonin levels. Data indicate, however, that individuals with low endogenous melatonin levels may be more responsive to exogenous melatonin. Generally, melatonin levels decrease with age; therefore, older individuals with insomnia represent an ideal population in which to study the effects of exogenous melatonin on sleep. This study will provide older adults with insomnia melatonin tablets to determine whether the tablets will increase their sleep.

Participation in this study will last 10 weeks and will comprise overnight visits at 2 timepoints, the beginning of Week 1 and the end of Week 6. At study entry, participants will be admitted to the General Clinical Research Center for a 3-night stay, beginning with an overnight urine screen to confirm low melatonin levels. Participants will also be asked to begin a sleep diary documenting their sleep quality and quantity; the diary will be used throughout the study. During Night 1 at the clinic, participants will have urine samples collected throughout the night. Night 2 will be an adaptation night to allow participants to get used to their surroundings. On Night 3, participants will have sensors attached to their bodies and a polysomnograph machine will be used to measure their sleep efficiency. Participants with sleep efficiencies of 80% or higher will complete their study participation. Participants with sleep efficiencies less than 80% will be randomly assigned to one of three study treatments daily for 6 weeks: high-dose melatonin (4.0 mg), low-dose melatonin (0.4 mg), or placebo. Participants will have study visits at Weeks 1, 3, and 6 to monitor for adverse events. After 6 weeks, participants will have 2 more overnight clinic visits that will be identical to Nights 2 and 3 from the beginning of the study. Sleep questionnaires, cognitive tests, and psychomotor tests will be used to assess participants at the beginning of the study, after 6 weeks, and at the end of the study. One month after the end of the study, participants will have a follow-up visit to be reassessed for adverse events.

Eligibility criteria: Inclusion Criteria:

* History of insomnia
* Low melatonin levels at study entry

Exclusion Criteria:

* History of sleep apnea (temporary cessation of breathing during sleep)
* Diagnosis of restless legs syndrome
* Current alcohol or substance abuse
* Dementia
* Anemia
* Liver disease
* Leukemia or lymphoma
* Asthma

Primary outcomes:
measure: Peak Melatonin Level
timeFrame: day 42
Secondary outcomes:
Other outcomes:
Locations:
city: Philadelphia
country: United States
facility: University of Pennsylvania
state: Pennsylvania
Study officials:
affiliation: University of Pennsylvania
name: Nalaka S. Gooneratne, MD,MSc
role: PRINCIPAL_INVESTIGATOR
References:
citation: Gooneratne NS, Edwards AY, Zhou C, Cuellar N, Grandner MA, Barrett JS. Melatonin pharmacokinetics following two different oral surge-sustained release doses in older adults. J Pineal Res. 2012 May;52(4):437-45. doi: 10.1111/j.1600-079X.2011.00958.x. Epub 2012 Feb 21.