← All sources
Morning light and cortisol awakening response
Study showing 30 min morning light exposure (10,000 lux) advances cortisol awakening response and improves subjective alertness and evening sleep quality.
Cortisol Effects
- CAR amplitude: 20-30% increase
- Cortisol peak: 30-45 min earlier
- Evening cortisol: lower
Sleep Benefits
Sleep onset: 20-30 min earlier; total sleep time: +25 min.
Outcomes
- Cortisol Awakening Response (CAR)25
- Sleep Onset Latency-25min (Minutes)
- Total Sleep Time25min (Minutes)