Light Exposure Patterns Predict Sleep Timing and Daytime Sleepiness
How Do Your Daily Light Exposure Patterns Affect Sleep Timing and Alertness?
Daily light exposure patterns strongly predict sleep timing and daytime sleepiness, with research showing that people who get brighter morning light naturally go to sleep earlier and experience less daytime sleepiness. Studies reveal that the timing, intensity, and duration of light exposure throughout the day create a “light signature” that influences circadian rhythms and sleep-wake patterns. Those with high morning light exposure and low evening light exposure show optimal sleep timing and alertness patterns, while the reverse pattern is associated with delayed sleep and increased daytime sleepiness.