Can't pull yourself away from scrolling through Instagram's feed when it's time for bed? That's a bad habit to keep up with according to a new study published in the "Proceedings of the National Academy of Sciences." The study insists late night gadget use may shake up sleep patterns and can harm your health in the long run. Method: Researcher Chang et al. conducted an inpatient study at Brigham and Women's Hospital in Boston. 12 participants were recruited to live in their lab for two weeks. For five consecutive nights the participants read e-books on an iPad for 4 hours before bedtime. And for the next five nights, they read a printed book for four hours before bedtime. Finding: The study was measuring how participant slept during the study. As a result, their were no difference with how long they slept during the study - but they way they slept. Researchers found that using light-emitting devices before bed prolonged the time it took to fall asleep. It suppressed levels of the sleep-inducing hormone melatonin, delayed circadian rhythms, and lower the amount of time participants got the deepest REM sleep levels. Implication: People who uses gadget before bedtime no only get grumpy in the morning. The study notes that lower melatonin levels can lead to other health consequences such as increased risks of breast cancer, colon cancer, and prostate cancer. Prevention: Some of the ways prevent irregular sleeping habit is switch to printed books, dim light on devices, and avoid temptation of an all-night TV binge. Further study: Since this study focus on a very narrow demographic the finding might not speak for everyone. Additional study should be consider to test if this effect men and women of different age. I'm sure everyone owns a mobile phone and use it before bed. Do you think it's affecting your mood in the morning? Your health?