The last few times I flew from IAD-LHR ye actual air time was < 6 hours. This is a short flight!
As I have aged, sleeping has gotten tougher.
2-3 days before flying from NA to EU, I intentionally wake up at 4am. On departure day I intentionally get up at 3am.
I enjoy the J dinner service and wine. Just before desert service, I take 0.75mg of Rx Xanax.
I usually get 3 hours of decent sleep while crossing the Atlantic to EU and feel great on arrival.
Xanax has a short half-life so no numbhead the next day like many sleeping pills produce.