Advice please

I'm a new RN working in LTC 11-7, 4 nights per week I work Alzh unit (weekend rotation) and 2 nights a week I work Medical/Psych with a lot of skilled pt's. (Rotating schedule). My question is in regards to Nurses working with Alz patients. When is it appropriate to medicate a pt with a PRN (for example, resistive to care, wandering etc)? I ask this because I have been told (and have refused in certain instances) to "just give them something" when they get out of hand or are up in the middle of the night. Usually if they are resitive to care (and in this unit a majority of them can be) I usually tell the aides to leave them be, and try again in about 30 min. If it is their shower day and I am hearing them scream in the shower (and I mean SCREAM) or become combative or say continuously "no!" I have, in the past, told the aides to just stop, change them if necassary, and put them back to bed. I have gotten strange looks from the day nurse when I tell them, so and so didn't get their shower because they were screaming, worked up and combative and I just rather not put them (the pt) through that. Am I wrong? When is enough enough? Or if someone is up wandering in the middle of the night like the case I had the other evening. This woman was simply walking around the unit. No behavior issues whatsoever, she was pleasant, I gave her a snack and something to drink etc. I did end up giving her something about 2:45am just because I did want her to get some sleep however, I know other nurses (with this same pt) that the minute she begins wandering they medicate her with trazadone. Is it just me? I don't see the need for it, she isn't doing anything wrong. I try to think to myself, can she simply just not be tired? Don't people wake up in the middle of the night? hungry? thirsty? Why do they need to be medicated. Maybe I'm crazy, I just don't get it! Don't get me wrong, if someone is out of control and is a danger to themself or staff I will and have medicated, but for simple everyday things like being up in the middle of the night I just don't see the need for it. Advice please? I appreciate it.