You can read manual for "Melatonin Мелатонин" on [ENG] and [RUS]:

How do circadian rhythms effect sleep
How much sleep do we need
Insomnia
Narcolepsy
Restless Legs Syndrome
Sleep a dynamic activity
Sleep Apnea
What about sleep and disease
What are sleep disorders
What Does Sleep Do For Us
What is REM sleep and why do we dream

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