Sleep Hormones 101: How Cortisol, Melatonin & Serotonin Control Your Night
You don't fall asleep because you decide to. You fall asleep because specific hormones tell your body it's time.
Understanding these hormones�and how to support them naturally�is the difference between fighting sleep all night and falling asleep within 10 minutes.
Meet the Big Three: Cortisol, Melatonin & Serotonin
Cortisol: Your Alarm Clock Hormone
Cortisol is your stress hormone, but it's not inherently bad. Your cortisol follows a rhythm: Lowest around midnight to 3 AM, Rising 3 AM to 8 AM, Highest 30-45 minutes after waking, Gradually declining throughout the day.
The problem: if your cortisol doesn't decline in the evening, you stay alert. You feel tired but wired.
Melatonin: Your Sleep Onset Hormone
Melatonin is released by your pineal gland in response to darkness. Very low all day, Rises as the sun sets, Peaks around 2-3 AM, Declines as morning approaches.
Serotonin: Your Mood & Sleep Regulation Hormone
Serotonin is your mood and confidence hormone. High during daylight, High after exercise and social connection, Converts to melatonin as evening approaches.
How to Support These Hormones Naturally
Support Cortisol: Get bright light within 30 minutes of waking, Keep consistent sleep times, Limit caffeine after 2 PM, Manage stress, Avoid intense exercise within 3 hours of bedtime.
Support Melatonin: Dim lights 1-2 hours before bed, No screens 1 hour before sleep, Keep bedroom dark, Keep consistent sleep schedule, Cool room temperature.
Support Serotonin: Get 20-30 minutes of morning sunlight, Exercise regularly, Social connection, Do things you're good at, Get outside during daylight.
The Bottom Line
You don't have insomnia because you're broken. You have insomnia because your hormones are out of sync with natural circadian rhythm. Master the rhythm, master your sleep.