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Melatonin replacement therapy of elderly insomniacs
1Sleep Laboratory, Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
Sleep
|September 1, 1995
Summary
Melatonin replacement therapy can improve sleep in elderly insomniacs with low melatonin levels. Both sustained-release and fast-release melatonin formulations showed benefits for sleep initiation and maintenance, with no tolerance developing.
Area of Science:
- Gerontology
- Sleep Medicine
- Pharmacology
Background:
- Sleep-wake pattern changes are characteristic of aging.
- Impaired melatonin secretion is linked to sleep disorders in older adults.
Purpose of the Study:
- To investigate the efficacy of melatonin replacement therapy in elderly individuals suffering from insomnia due to melatonin deficiency.
Main Methods:
- A randomized controlled trial with a running-in period followed by four experimental periods.
- Administration of 2 mg sustained-release (SR) or fast-release (FR) melatonin, or placebo, for 7 days.
- A 2-month treatment with 1 mg SR melatonin.
- Sleep-wake patterns monitored using wrist-worn actigraphy.
Main Results:
- One-week treatment with 2 mg SR melatonin improved sleep maintenance (sleep efficiency, activity).
- One-week treatment with 2 mg FR melatonin improved sleep initiation.
- 2-month treatment with 1 mg SR melatonin further enhanced both sleep initiation and maintenance, suggesting no tolerance development.
- Sleep quality declined after treatment cessation.
Conclusions:
- Melatonin replacement therapy appears beneficial for both sleep initiation and maintenance in melatonin-deficient elderly insomniacs.
- Sustained-release melatonin may be particularly effective for sleep maintenance.
- Long-term use did not lead to tolerance, and benefits ceased upon discontinuation.