Montelukast
"I took singulair for the 1st time last night and have been awake ever since. I also notice out of the blue I started crying. I know it was the medicine because before taking it I slept well for the most part. This morning I got up and reread the possible side affects and last night will be my 1st and last time taking singulair.  The sad part is I have to go to work n all I wanna do is sleep "