My daughter is 20 years old and a chronic asthmatic with severe a...

My daughter is 20 years old and a chronic asthmatic with severe allergies. She has been on Singulair for 8 years. She has been complaining and in some instances begging her asthma doctor for a reason for her insomnia and restless sleep over the last several years. She takes other asthma and allergy medications. He told her to not take her Xopenex inhaler before bed, as that may be causing the problem, that didn't help at all (sometimes a Xopenex nebulizer treatment is needed for her at bedtime and during the night, during asthma flair-ups). Her doctor just switched her from Allegra (which she has been on since she was 10) to Zyrtec, which is helping with allergies, but not with the sleeplessness. She was taken off of Advair and put on Symbicort in September 2007, this made her asthma worse requiring Prednisone off -and -on since January. She is back on Advair and doing better, but the sleepless nights continue... We are seriously contemplating taking her off of the Singulair. We aren't 100% certain this medication is causing her insomnia/sleeplessness. However, as she explains it..."If I could get one really good nights sleep, I would go off of the Singulair in a heartbeat". Our fear is that by going off of the Singulair that her asthma will worsen.