Chorus snorus.

I fall asleep everywhere--in class, after school, even in choir. I once dozed off right in the middle of practice. No matter how early I go to bed, I can't fall asleep until after 3 a.m. What's wrong with me?

There's no way you're getting the Z's you need. Girls your age require nine hours a night. That's why you're exhausted. In teens, there's something called delayed sleep phase, explains Dr. Judith Owens, director of pediatrics, Sleep Disorders Clinic at Hasbro Children's Hospital, Providence, R.I., in which your body's natural sleep and wake-up times are later than they should be. Put simply, you might be an extreme night owl. Or maybe you have insomnia--difficulty falling asleep. Get on a strict bedtime schedule (10 p.m. is ideal if you get up at 7 a.m.), and avoid buzz-causing drinks like cola. If that doesn't work, talk to your mom about seeing a sleep specialist, who might check you for narcolepsy, a condition in which people fall asleep at all hours of the day. As long as you don't drive, your problem isn't dangerous, just tiring.

I'm 13, and I feel lumps in my breasts. Is this normal? Do I have breast cancer?

Rest assured that you're probably very healthy--breast cancer almost never occurs in teens. Rest double-assured because you're obviously knowledgeable about your bod, and that will keep you abreast (pardon the pun) of your health issues. What you're most likely feeling are some of the many small glands that are naturally in your breast tissue, explains Dr. Elizabeth G. Stewart, gynecologist and author of The V Book. But just one lump is probably a harmless cyst from a breast duct that's temporarily plugged with fluid. This usually goes away on its own. Just to be safe, ask your doctor to check it out.

My bones pop sometimes. It's embarrassing. Can you help?

Some people pop more than others. The knuckles, knees, ankles, back and neck are fluid-filled. When you move, the joint stretches and gas is released creating a sound. A noise that's more of a snap than a crack may be a tendon that's moved out of place and is returning to its position. Is it painful? Then see a doc, says Dr. Edward G. McFarland, director, Adult Orthopaedics Division, Johns Hopkins University School of Medicine, Baltimore. No pain, no worry.

Stumper of your own? Send your question to Body Q&A, Girls' Life, 4517 Harford Road, Baltimore, MD 21214, or e-mail it to [e-mail].