Barrow BNI has a good night float system and is an excellent program. It's had night float for >3 years.
Currently it runs like this:
PGY2 (4 separate weeks, the 1st week doubled up with a senior)
PGY3 (3 separate weeks)
PGY4 (2 separate weeks, the 1st week doubled up with a junior)
The weeks are not done back to back. It's a 7 days straight system Fri-Fri, so the weekend nights are covered by the nightfloat resident. i.e. if you're not on night float you don't do overnight call on adult neurology.
Night float covers one busy hospital which allows for this system to work. ER consults (including strokes), admits (ER & transfers), inpatient consults, crosscover (patients already admitted to neuro).
Some nights are busy, 12 hrs work straight (no rest & you still hand off patients in the morning), others are not (a few hours of interrupted downtime/sleep). My guess is Average 6-8 patients seen a night (fewest 4, most 13). Attendings are available by phone. The 1st night float week as a PGY2, a senior is in house to help see patients/teach/supervise.
Personally, having worked both night float & overnight systems, night float is much better overall. Especially for busier departments. But it depends on the setup.
If you wanna know more about Barrow ask or PM me. It'll be interesting to hear how other people do it.