Fig. 5
From: Circadian phase advances in children during camping life according to the natural light-dark cycle
Relationships between habitual sleep timing and change in salivary melatonin onset time. Change in salivary dim light melatonin onset (DLMO), which is a marker of circadian phase, was related to habitual sleep timing (mid-sleep point) before the camping program in the earlier wake time (EW) condition (A) and in the synchronized wake time (SW) condition (B). The vertical axis shows the change in DLMO [h] and the horizontal axis shows the mid-sleep point [h] before the camping program