S2S,First off, what time is your appointment and do you have someone to drive you to your appointment as well as bring you back home?
If you have a prescription for Klonopin and your tablets are .5mg you could cut one in half to make a .25mg dose to help ensure that you are not to sleepy - always check with your Dr. when adjusting a dose of your medication.
I suspect he would say this is OK, however, I am not a Dr.
Good Luck and remember we are here for you.
Kindly,
Kitt