You know when you sleep poorly.
Stop wondering why.
Your cortisol curve explains why you can't sleep—and why that's affecting your recovery.
Here’s how disrupted cortisol affects sleep + recovery.
SLEEP DISRUPTION
You’re exhausted despite enough rest.
RECOVERY
You wake up foggy,no matter how long you sleep.
SLEEP ONSET
You're tired, but you just can’t fall asleep.
Here’s how disrupted cortisol affects sleep + recovery.
THE CHALLENGE
Your sleep tracker shows symptoms.
Eli shows the cause.
You already know your sleep is broken—your wearable tells you every morning.
But HRV scores and sleep stage data can't pinpoint your cortisol levels and how they may be sabotaging your sleep.
Eli bridges the gap with data to show you what’s actually behind your symptoms.
| Wearable/Sleep tracker | Lab Testing | ||
|---|---|---|---|
| Measures cortisol (diurnal) curve | |||
| Results in minutes | Not accurate | 1-2 weeks | |
| Test anytime, anywhere | Not accurate | Schedule around clinic hours | |
| Captures morning + evening patterns | No, usually 1 pattern | ||
| Lab-grade accuracy |
COMPLETE PICTURE
Stop guessing what's wrong.
Start measuring what's broken.
Before overhauling your sleep routine or trying another supplement, make sure your cortisol curve is within range.
Eli uses real-time data to help identify the root of your sleep disruption.
Cortisol: Understanding the diurnal curve
Eli measures your diurnal curve anytime, anywhere—which should peak in the morning and drop in the evening.
But when cortisol stays elevated, your body physically can’t enter deep sleep. When morning cortisol won’t rise, you might struggle to wake up refreshed.
Get lab-grade results to help you see what's broken, adjust your routine, and monitor weekly improvement.
Cortisol affects more than sleep.
Brain fog, poor focus
Low morning energy
Burned out, midday exhaustion
Unexplained weight gain
How it works
Test, track, and learn.
Step 01
Collect your saliva.
Step 02
Scan it with the Eli app.
Step 03
See your cortisol and wearable data all in one place.
Sleep Optimization Kit
Cortisol tests + Eli app
Track cortisol weekly to map your curve and spot potential interference. Adjust with data to stay on track.
Saliva-based test
Real-time results
Lab-grade accuracy
AI-powered iPhone app (iPhone only)
Testimonials
What Eli users are saying
Cortisol tracking could complement existing devices. For example, if your smartwatch detects disrupted sleep, Eli’s Hormometer could help you see whether stress hormones are a factor.
Patterns you can actually see.
I finally understand how my body responds to stress throughout the day. I can see patterns I never had access to before.
Maya
Expert-led, from research to results.
Fady Hannah-Shmouni, MD
Endocrinologist and geneticist at the University of British Columbia.
Focus: Longevity healthcare.
Alicia Robbins, MD
Board-certified OBGYN and Certified Menopause Practitioner.
Focus: Midlife transitions healthcare.
Olivia Lesslar, MD
Physician and lecturer working across brain health, trauma, and recovery.
Focus: Integrative longevity healthcare.
CORTISOL
Dr. Andrew Huberman on Cortisol and Burnout
CORTISOL
Understanding Cortisol: Ranges, Variability, and Why Tracking Matters
Cortisol
Five Ways to Balance Your Cortisol
DISCLAIMER: This test is a wellness device. It is not intended to diagnose, treat, cure, prevent, or manage any disease or medical condition, including adrenal disorders such as Addison's disease, Cushing's syndrome, or sleep disorders. It provides lifestyle and wellness insights only. Always consult a licensed healthcare provider for medical concerns, especially if you have chronic insomnia, sleep apnea, or other diagnosed conditions. Do not stop or modify prescribed medications without medical supervision.
REFERENCES
¹ Vgontzas AN, et al. Chronic insomnia is associated with nyctohemeral activation of the HPA axis. J Clin Endocrinol Metab. 2001.
² Buckley TM, Schatzberg AF. On the interactions of the HPA axis and sleep. Psychiatr Clin North Am. 2005.
³ Adam EK, et al. Day-to-day dynamics of experience–cortisol associations. Psychoneuroendocrinology. 2006.
⁴ Kumari M, et al. Association of diurnal patterns in salivary cortisol with all-cause and cardiovascular mortality. PNAS. 2011.
⁵ Bellingrath S, et al. Chronic work stress and exhaustion is associated with higher allostastic load. Psychoneuroendocrinology. 2010.
⁶ Adam EK, et al. Diurnal cortisol slope and mental and physical health outcomes. Psychoneuroendocrinology. 2017.
⁷ Leproult R, et al. Sleep loss results in an elevation of cortisol levels the next evening. Am J Physiol Endocrinol Metab. 2007.