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A salivary measure of your body's active stress hormone at the moment of awakening, establishing the baseline from which the morning cortisol surge is measured.
This sample captures cortisol at the sensation of waking, before you get out of bed. It represents the starting point of the cortisol awakening response (CAR), the burst of cortisol your body produces in the first 30 to 60 minutes after you open your eyes.
The waking value is distinct from the rest of the day's cortisol pattern. Studies have found that the CAR is relatively independent of cortisol levels during the remainder of the day. The CAR may be viewed as a marker of your HPA axis (hypothalamic-pituitary-adrenal axis) resilience and reactivity, reflecting how well your brain's stress system can mobilize for the day ahead. The CAR is neither a general HPA axis marker nor a response to stress; it is an anticipatory signal.
Low waking cortisol may be associated with fatigue, burnout, low mood, low motivation, low libido, dizziness, weakness, and orthostatic hypotension. It can reflect long-term stress, poor sleep hygiene, untreated chronic sleep apnea, pituitary or hypothalamic dysfunction, and certain medications known to suppress HPA axis activity, including glucocorticoids, opioids, NSAIDs, and tricyclic antidepressants.
High waking cortisol may indicate that your CAR had already begun before you collected the sample. It can also be associated with stress, low blood sugar, sleep apnea, pain, or alcohol consumption the night prior. A high waking cortisol may be associated with a blunted CAR, because cortisol has already risen before the +30 minute sample, masking the expected surge.
Always compare this value with the waking cortisone reading. Salivary cortisone correlates with blood free cortisol better than salivary cortisol does. If cortisol is low but cortisone is normal or elevated, your true circulating cortisol may not be as low as the cortisol number alone implies.
For low waking cortisol, foundational HPA axis support may include B vitamins, vitamin C, adaptogenic herbs (ashwagandha, rhodiola, Korean ginseng, cordyceps, schizandra), blood sugar regulation, and light exposure upon waking such as sunlight or full-spectrum lighting. Licorice root can limit the deactivation of cortisol into cortisone, potentially raising active cortisol levels, though it must be used with caution in individuals with high blood pressure.
For high waking cortisol, calming herbs (skullcap, holy basil, chamomile, lemon balm, passionflower, valerian), parasympathetic nervous system support (meditation, breath work, vagal nerve stimulation), GABA support, and addressing underlying stressors may help. Sleep apnea, if present, should be evaluated and treated.