today is my first day on Singulair. I didn't get as much sleep as usual last night as I had an early Dr. appointment this morning. My asthmas has been acting up and I thought it might be allergies so my Dr. gave me some samples of Singulair. Thinking that there is no time like the present, I took my first pill in the car driving from my appointment. I have been fighting sleep all day at work and it just occured to me that it might be the medicine. I have pins and needles in one arm and didn't think of the connection until looking at possible side effects of this drug. I might be foolish, but I will try it again tomorrow to see if it persists. Wish me luck!!