They say sleep is important...

[dolphindanny]

sometimes I have hard time sleeping because of my back problems (also might make my speech worse). hmmm should I take nyquil so I can knock out and sleep peace fully?

[berrylicious]

I have also found that sleep is very important to being able to speak fluently; I get noticeably much more blocks when I'm sleep deprived, and I can be incredibly fluent after taking a mid-day nap. As for medication, I've tried taking diphenhydramine before interviews but found that it didnt help me get restful sleep and made me drowsy the next day. I'd recommend melatonin which works more naturally to promote sleep without the sedating effects.