Final answer:
The major finding from the KP-Rhythm study was that light exposure during the day is important for regulating circadian rhythm and improving sleep quality.
Step-by-step explanation:
The major finding from the KP-Rhythm study was that light exposure during the day is important for regulating circadian rhythm and improving sleep quality. The study showed that individuals who were exposed to more natural light during the day experienced better sleep at night. This finding supports the idea that light exposure plays a crucial role in maintaining a healthy sleep-wake cycle.