Is it possible to take too much melatonin? We asked the experts National Geographic 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 How Much Melatonin Is Too Much? BrainMD BrainMD With melatonin overdoses among children on rise, parents should understand the risks and red flags NKyTribune Can You Overdose on Melatonin?