Slide through the day to see how your master hormones fluctuate based on your genetic chronotype.
Peak Alertness. Cortisol is surging to clear morning adenosine.
Cortisol (Alertness)
Melatonin (Sleepiness)
Knowing the curves is step one. The ARC app actively builds your schedule to align with these exact peaks and valleys automatically.
Download ARC AppYour body's internal clock is driven by the precise, oscillating relationship between two master hormones: Cortisol and Melatonin. They operate as opposites on a 24-hour spectrum.
Often called the "stress hormone," cortisol is actually your primary driver of wakefulness and cognitive focus. In a healthy circadian rhythm, cortisol surges in the morning (triggered by light hitting your eyes) to clear out the chemical buildup of sleep and prepare you for action. It naturally tapers off as the day progresses.
Melatonin is the signal that tells your body it is time to sleep. It is produced by the pineal gland in response to darkness. As evening approaches and blue light fades, melatonin levels rise, causing your core body temperature to drop and preparing your brain for memory consolidation and tissue repair.
While everyone follows this general pattern, your chronotype dictates when these peaks and valleys occur. A Lion's cortisol spike happens hours before a Wolf's. Trying to force a Wolf to do deep analytical work at 8:00 AM is biologically hostile because their cortisol hasn't risen yet, and melatonin may still be active in their system.