If possible, I always try and book the early morning return so that I avoid having to try and sleep on the short overnight. And that's the case for me in any class as the flight home is way too short to get any meaningful sleep. If in Y, it makes the experience far more palatable for me.

And remember - you are flying all the way to NY and back for what - £400 compared to around £1500 or more? I have done it many times and I lived to tell the tale. It's 7 hours sitting while someone feeds you, watch movies, read a book. Hardly a difficulty. Heck most people spend more time at their desk each day doing some menial task they'd happily give up if they could.