Is F (non-suites if it matters) generally considered worth it on redeye European routes, or only on daytime flights? They're ~13-14 hours and departing around midnight, so there's some time awake but it's mostly spent asleep, in which case it's mostly about the bed, and I generally sleep pretty well in J. I get that the service and stuff is better, and also the redeye has the benefit of a full day before departing and upon landing, but just curious how more regular SQ flyers think about F vs J on such routes