My kids are early risers - but its my own fault because they go to bed at sevenish - so 11 or 12 hours is a pretty good night. The general rule - if the sun is up, you can get up, if not, stay in bed. But, the times I want a little extra shut eye myself, I've tried this trick...
In a clean room, I simply set out a few puzzles, or toys (this is another topic, but I rotate toys, just so I always have a newish toy ready). Anyhow, if there is a new something out before they reach their door, they will usually sit down and play. I have built a house out of books - just something different to draw their attention.
Any other good ideas?