My daughter just turned 10. She has suddenly started acting cranky and is extremely tired. She usually goes to bed around 10 in the summer. But last week or more she has been so sleepy she ask to go to bed before 7 at night and then wakes in morning still tired. I took her to doctor and she checked her for Mono. it was negative. But they did say her white blood count was very low. I am getting worried because no improvement.