One of the leading theories of what causes cancer is “free radical” damage to DNA. Melatonin happens to be a very powerful antioxidant, able to neutralize free radicals.⁠ .⁠ .⁠ Decreased melatonin has massive consequences – disturbed sleep (obviously), worse mood and attention, increased blood sugar and fats, increased weight gain, less tissue repair (because it is also a powerful antioxidant), and more. Lack of sleep and lack of melatonin has been linked to increased risk in cancer, heart disea