For being on 3 hours sleep, I think I'm doing ok. My appetite gets really odd when I travel like this, across time zones and being up at odd hours (for me). Early in the morning, it is nonexistent. I marvel at the people I see in the airport Burger King shoving down their morning fare. The thought of putting something in my mouth at 5 am does not appeal to me.
I know in three hours, when I get off the plane again, I will be RAVENOUS. But my body definitely needs time to wake up.