My son is 12 year s old, and he is tired all the time. even on weekend s. when he was about 8 year s old he had asthma so his doctor had him use the nebulizer 3 times a day. when he turned 10 his asthma seemed to get better , so we stopped the nebulizer and he just used the inhaler durning school only for P.E. i dont know if stopping the neblizer had anything to do with him being tired all the time. but family members/friends have noticed that he is always tired as well. my son has told me after he uses the inhaler that he seems to have more energy after. he also has said that his heart beats fast when he is just sitting down for no reason. i took him to the dr for a physical a few days ago and his lab results came back normal. if u can give me advice on what to do that be great. Thanks.