Agree, I only flew once in F on a night flight and my sleeping was worse than in CW.
Yes, seat is wider/bigger, yes it's nicer, but it's exposed and I could feel some cold air on my back regardless how I tried to sleep. Plus the noise from the seat 1K, who's occupant was having a champagne party there... UD on 747 or mini-cabin on AA's 77W are my favourite spots for a night flight in CW.