I don't sleep on them (if I can) because I love flying and get pissed off if I miss it, especially take-off and landing. I used to have a tantrum as a kid if I fell asleep on a long haul flight.
If you can get through not sleeping, you just sleep really well your first night and jetlag isn't an issue.
I can get drinking little if you don't have access to the aisle, though even then drinking nothing is fucking stupid.
Not eating and entertaining yourself is just being silly.