I go for night time flights. I live in the UK and work in Nairobi on a long term contract (been there since 2001). I tend to sleep on all flights, and like to be awake for a few hours after landing. KLM / BA tend to land at about 20:00 / 21:00, so it is almost bed time when you get there, (but not when you left), so I tend to be wide awake, and have a disturbed nights sleep when I get there. Overnight KLM (means I can leave Manchester at about 16:00), or Emirates do it for me.