Chronotype Visualizer: Your Day by the Hour

Slide through the day to see how cortisol and melatonin timing shifts with your chronotype.

8:00 AM

Morning rise. Cortisol peaks in the first hour after waking, helping you feel alert.

6:00 AM12:00 PM6:00 PM12:00 AM

Cortisol (Alertness)

90%

Melatonin (Sleepiness)

5%

Illustrative curve, not measured hormone levels.

From a typical curve to your own day

ARC shifts every phase of your day by your chronotype, then checks it against your one-tap energy check-ins. After about 10 days it measures when your afternoon dip really lands and moves the window.

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The Dance of Cortisol and Melatonin

Your master clock, the suprachiasmatic nucleus (SCN) in the brain, times two key signals: cortisol and melatonin. They run roughly opposite each other across the 24-hour day.

Cortisol: The Alertness Driver

Often called the "stress hormone," cortisol is also part of how you wake up. It rises in the first hour after waking, helping you feel alert, and morning daylight strengthens that rise. It then tapers off as the day goes on.

Melatonin: The Sleep Signal

Melatonin tells your body it's night. The pineal gland releases it in response to darkness, starting roughly two hours before your natural bedtime. As it rises, your core body temperature drops and sleep gets easier. Bright evening light can delay that rise.

How Chronotypes Shift the Curve

Everyone follows the same general pattern, but your chronotype shifts when the peaks and valleys happen. A Lion's cortisol rise comes hours before a Wolf's. At 8:00 AM a Wolf's cortisol may not have risen yet and melatonin can still be present, which is why deep analytical work usually goes better for them later in the day.

Frequently asked questions

When does cortisol peak?

Cortisol rises sharply in the first 30 to 45 minutes after waking (the cortisol awakening response), then drifts down through the day and reaches its lowest point around the middle of the night.

When does melatonin start rising?

Melatonin usually starts rising about two hours before your natural bedtime in dim light, peaks in the middle of the night, and falls away towards morning. Bright light in the evening can push that rise later.

Does my chronotype change my hormone timing?

Yes. The shape of the curves is similar for everyone, but an early chronotype's curves run earlier and a late chronotype's run later, which is why a Wolf can feel groggy at an hour when a Lion is already at their best.

Are these real hormone levels?

No. The percentages are an illustrative model based on typical timing for each chronotype, not measurements. Real levels vary from person to person and day to day.

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