If your child has sleep issues due to ADHD and the other sleep suggestions from yesterday do not work, there is another option. Students may benefit from the hormone supplement melatonin to induce drowsiness. Melatonin is produced naturally in the brain as the sun goes down, signaling that bedtime is coming within a few hours. The theory is that taking this supplement may help people with true insomnia fall asleep. Ask your doctor before trying this option and only use it as a last resort.