I sleep anywhere from 6-8 hours every night. I don't see the issue you have here. On Saturday I go to BRU and depart at 10:25 on Monday, which is 4:25 back home. Pick up for international departures varies by location, so BRU is 2:00 prior, making it 2:25 back home with a 1:25 wake up call. I have only on occasion not been able to sleep in Europe, but I do sleep until I wake up on arrival. Having a 2 hour or so break helps as well as I don't have problems sleeping on the jet.