Originally Posted by OskiBear

I've done it once in each direction and on the way to SIN, it was so long that I recall two sessions of sleeping. I can generally sleep any time and anywhere, but this flight was so long that I did what you described and still woke up, watched a few movies and then hunkered down for another long sleep until shortly before arrival. You'll probably get enough hours of sleep given how long the flight is - you'll just be a bit off based on usual jet lag effects. I personally prefer being awake an hour or two prior to arrival to "wake up"