Melatonin is not a sleeping pill – it is a timing signal. Produced by the pineal gland in response to darkness, it tells your body what time of day it is and primes the brain for sleep. This distinction matters enormously: melatonin does not put you to sleep the way a sedative does. It shifts your c

Melatonin is not a sleeping pill – it is a timing signal. Produced by the pineal gland in response to darkness, it tells your body what time of day it is and primes the brain for sleep. This distinction matters enormously: melatonin does not put you to sleep the way a sedative does. It shifts your circadian phase so that sleep comes more easily at the right time. Taking it at the wrong time or in the wrong dose can shift your body clock in the wrong direction entirely.

The cortisol awakening response (CAR) – a natural cortisol surge in the 30-45 minutes after waking – is your body’s natural energiser. It peaks around 8-9am for most people and sets the tone for the entire day. Melatonin is at its lowest point in the morning. The two hormones should be opposite in their daily curves: cortisol high in the morning, melatonin high at night. When you take melatonin in the morning – which many people accidentally do because they wake at 3am and take it then – you are actively working against your cortisol rhythm and confusing your circadian system.

The Dose Problem

Most commercial melatonin supplements come in doses of 3mg to 10mg. The physiological melatonin production in a healthy adult is 0.1mg to 0.5mg per night. The supplements are delivering 10 to 100 times the natural dose. At high doses, melatonin becomes immunosuppressive, disrupts the cortisol rhythm, and can cause next-day grogginess that mimics a hangover. Low-dose melatonin (0.3mg to 0.5mg) – the dose used in most European countries and in research settings – produces the circadian phase shift without the next-day sedation.

YU SLEEP is formulated to work with your natural melatonin rhythm rather than overriding it. By moderating cortisol in the evening and supporting parasympathetic activity, it helps your body produce its own melatonin at the right time and in the right amount. This is the physiological approach to sleep – working with your body’s own signals rather than flooding the system with exogenous hormones.

If you use melatonin, switch to a low-dose version (0.3mg to 0.5mg) and only take it within 2 hours of your intended sleep time. Do not take it in the middle of the night. Get bright light exposure in the morning to strengthen your natural cortisol rhythm, which in turn produces a stronger and more appropriately-timed melatonin peak at night. YU SLEEP as a nightly protocol supports this rhythm rather than overriding it.