The goal of this clinical trial is to learn if iron supplementation works to restless sleep in youth with ADHD. A second goal is to learn if iron supplementation helps to ease ADHD symptoms. The main questions that this trial aims to answer are: Does 3 months of iron supplementation treatment improve parent- and youth self-reported sleep difficulties more than placebo? Does 3 months of iron supplementation treatment improve sleep as measured by actigraphy more than placebo? Does 3 months of iron supplementation treatment improve parent-reported and/or objectively measured attention more than placebo? Researchers will compare over-the-counter iron supplementation treatment to a placebo (a look-alike substance that contains no drug) to see if iron supplementation works to treat sleep difficulties in youth with ADHD. Participants will: * Take iron supplements every day for 3 months * Visit the clinic once before treatment begins and once at the end of treatment to complete tests and rating scales related to sleep and attention * Wear motion-monitoring leg bands while sleeping for one 2-week period before treatment begins and one 2-week period at the end of treatment
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Sleep Efficiency
Timeframe: Sleep efficiency will be assessed nightly for 2 weeks before treatment begins and then again for 2 weeks at the end of treatment.