Devin Overington presented on the effect of self-luminous devices on melatonin levels in teens. The hypothesis is that using self-luminous devices for two hours before bed will suppress melatonin levels more than evening activities without these devices. The study will involve collecting light exposure data and melatonin levels from saliva tests of 20 high school students over two weeks - one with normal device use and one refraining from devices before bed. The results and any discussion points will be analyzed to conclude on the hypothesis.