We trialed the BIS monitor in our unit a few years ago. I for one LOVED it! It didn't get approved because of the cost of the unit and that each probe costs $17 each!
Sedation is a fine line. You could give the same dose of ativan to two different pt's and it would affect each one differently. I bring this up to my manager all the time. Seems the Intensivists thought that I oversedated my pt once. Well, when a pt on the vent is rattling the side rails and biting the ETT, that calls for some sedation to me.

I had to give him something every hour to keep him from getting agitated and bucking the vent. But I digress.
I would LOVE to see the BIS monitor brought back to our unit. But again , the powers that be probably won't because of the cost. I think they could really help keep a pt sedated at the right level. Especially with new nurses. Good luck!