When I was a CNA back in the early 90s, I used to give my residents showers on the evening shift before I put them back to bed. I couldn't stand them being smelly and sitting on the shower chair actually help them have a BM and empty out their bladders. Man, the NOC CNA's loved me for that and the residents seem more relaxed in bed afterwards. As for giving baths late at night, not a good idea. Too cold for that.