On the 77W I would recommend seat 2A or 2K if you're traveling alone.
On a flight with that timing I'd probably have dinner after departure, relax for a bit, then go to sleep. You can certainly ask the FA to wake you whenever you want. FYI if you don't wake up to their knocking on the door, they can open the door from a button in the closet as well.
Have a great flight!