Serum Cortisol Concentration (mmol/L)

Cortisol is one of the three standard bio-markers (along with Melatonin and Body Temperature) for mammalian circadian rhythms. Essentially, you ought to feel more awake the higher your Serum Cortisol Concentration is. Measured in micromoles per liter, Serum Cortisol Concentrations provide helpful insight into the nature of sleep. Analyze your circadian rhythm by looking at the graph below. This graph represents the average human Cortisol Concentrations over a 24 hour period of time.

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Total Daily Concentration of Serum Cortisol (mmol/L)
Time (hours) and Current Serum Cortisol Concentration (mmol/L)

Source: National Institutes of Health:, Journal of Biological Rhythms:

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