I am taking busporine 2x a day and having trouble sleeping my doctor gave me trazadone 100mg to take at bedtime should i do half? or take the full?

I see that it's not recommended to take trazadone and buspirone together, but your prescribing MD may have much experience with this combination and is comfortable with your taking them. I always start with a lower dose of trazadone for sleep such as 50mgs & titrate up, however. This may be a good idea for you where you're also taking buspirone.