Overview

• Researchers demonstrated that 20 minutes of natural light exposure before waking significantly improves alertness compared to no exposure or extended light from dawn.
• The study utilized EEG, ECG, and surveys to objectively and subjectively measure sleepiness, fatigue, and alertness in 19 participants under controlled conditions.
• Excessive light exposure starting at dawn was found to disrupt sleep, underscoring the importance of timing in maximizing benefits.
• The findings suggest practical applications in residential design, including motorized curtains and smart home systems, to optimize sleep-wake transitions.
• Future research aims to refine light exposure strategies based on seasonal and daily variations to further enhance morning wakefulness.