Delayed sleep phase disorder (DSPD) and control group differences in Download Scientific Diagram Comparing Effects of Melatonin versus Trazodone on Sleep Quality in Major Depressed Patients Receiving Sertraline Semantic Scholar Melatonin and sleep ScienceDirect Melatonin tells your body when its time to sleep, but too much screen time can lower its levels. Most people take before bed, but timing also matters! Taking it 1 2 hours before bedtime in Melatonin and Sleep Gateway Psychiatric