Melatonin and Sleep: how the sleep hormone works | Canadian Medical

Melatonin and Sleep: how the sleep hormone works

News

19. 01. 2026

Is falling asleep a matter of minutes for you, or a nightly test of patience? Sleep problems are among the most common health complaints today and have a direct impact on performance, immunity, and mental well-being. One of the key factors regulating sleep is the hormone melatonin, says MUDr. Barbora Hradecká, sleep medicine specialist and Head of the ENT Department.

What is melatonin and why it ss important for sleep

Melatonin is a hormone naturally produced in the human body, specifically in the pineal gland. Its main role is to regulate the circadian rhythm – the internal biological clock that determines when we are awake and when we are ready to sleep.

As darkness falls, melatonin levels rise and send a signal to the brain that it is time to slow down and prepare for sleep. In contrast, daylight – especially blue light from mobile phones, tablets, and computers – significantly suppresses its production.

How melatonin works in the body

Melatonin does not work like conventional sleeping pills. It is not a sedative that “forces” sleep. Its purpose is to induce a natural feeling of sleepiness and help align the body with a regular sleep–wake cycle.

It mainly helps to:

  • reduce the time needed to fall asleep,
  • stabilize the sleep rhythm,
  • improve the quality of nighttime rest.
When melatonin can be helpful

Melatonin is particularly useful in cases of short-term disruption of the sleep schedule. It is typically used:

  • when traveling across time zones (jet lag),
  • after changes in daily or work routines,
  • during temporary shifts in bedtime.
Melatonin as a dietary supplement – what to watch out for

Melatonin is also available as a dietary supplement. However, a higher dose does not mean a better effect. On the contrary, it may lead to unwanted effects such as morning fatigue, headaches, a feeling of dullness, or disruption of the body’s natural hormonal balance.

Melatonin should not be used as a long-term solution for chronic sleep disorders. If difficulties with falling asleep recur or persist for weeks or months, it is essential to look for their underlying cause.

Long-term sleep problems should be treated by a doctor

Chronic insomnia may be related to stress, hormonal changes, ENT conditions, sleep-related breathing disorders, or other sleep disorders. In such cases, self-treatment with melatonin does not solve the problem and may delay proper diagnosis.

Quality sleep starts with proper diagnosis

A well-adjusted sleep routine, reduced exposure to light in the evening, and professional medical evaluation are the foundation of healthy sleep. At Canadian Medical, we take a comprehensive approach to sleep problems and focus on identifying their true cause – not just short-term solutions.

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