We have a night float system and everyone loves it. It’s sucks a little while you are on night float, but it’s definitely worth it for the rest of the year. Our current system is as follows.
Night float works 5 nights a week from 6 PM to 8 AM Sunday through Thursday (call ends at 6 AM, but resident leaves by 8 AM after conference). That makes Friday night, all day Saturday, and Sunday morning the only days available in the call pool, so we only need to split up 8 days in the call pool per month (two residents work two 12 hour shifts per weekend). If anything, I think we end up having less hand off errors because you usually have the same junior during the daytime and the same resident during night float (only exceptions are weekends).
On certain days, it can get busy on call, especially if you have a surgical case come in. That’s why we always have a chief on as backup in case something surgical comes in and the junior is too busy to take it to the OR. If you have specific questions, feel free to PM me.