Body clock active 250 wakes you up gradually with a simulated sunrise the brightening light brings you gently out of sleep prompting your body to suppress the sleep hormone melatonin while increasing hormones like cortisol to help you get up and go it provides a fantastic start to the day for sufferers of sad seasonal affective disorder and helps non morning people to feel brighter and more energetic waking to natural light resets your sleepwake cycle and has been shown to boost your moo