Sleep expert explains when melatonin helps — and when it can do more harm | ChicagoLIVE

After a new study linked melatonin to possible heart health risks, "ChicagoLIVE" speaks with a sleep medicine specialist from Northwestern University about what the research really means. She explains when melatonin can be helpful, why timing and dosage matter more than strength, and how high doses may do more harm than good.