Impact of Sleep Duration on Immune Balance in Urban Children With Asthma

This study is investigating how sleep duration affects the immune system in children with asthma who are allergic (atopic). Researchers believe that getting too little or too much sleep may change immune cell behavior, which could worsen asthma symptoms. This is an observational study — no new treatments are given. **You may be eligible if...** - Your child is between 7 and 11 years old - Your child has been diagnosed with asthma by a doctor - Your child has persistent asthma requiring a daily controller medication - Your child gets between 9 and 11 hours of sleep per day - Your child has a positive allergy test (to dust mites, mold, or cockroach) - You and your child live in an urban area **You may NOT be eligible if...** - Your child has a serious immune system disorder - Your child has significant other health conditions (e.g., heart or lung disease unrelated to asthma) - Your child uses medications that affect the immune system (like steroids) - Your child regularly gets much less or more sleep than the study range Talk to your doctor to see if this trial is right for you.