I Am Taking 40mg 2 X A Day Morning And

I am taking 40mg 2 X a day morning and night. I have a hard time sleeping soundly at night and feel tired most of the day. I have also gained 5 lbs since starting to take it 2 months ago. I exercise 5 days a week and run up to 15 miles in a week. The tremors are all but gone. Would there be any harm in just taking 1 tablet a day instead of 2