There are two different types of humans: those who allow us felines to sleep on their beds, and those who don't. I am very lucky to have a human who does allow me on the bed. In fact, she even allows me in the bed. The trick to maintaining devilcat status is to be unpredictable. The moment humans expect anything of you, you're doomed.
I mix up my bedroom behaviour. Sometimes, I'm there quite early, on the bed before E is asleep. Othertimes, I lurk around outside the bedroom, ignoring her inquiring calls, waiting to sneak in much later, in the middle of the night.
The other thing to mix up is location. There's the option of ON the bed. When choosing this option, it's essential to find a comfy warm position between your human's legs. This may sound rude, but if you're on top of the doona, it's fine. (It is also extremely irritating for your human, who is pinned and cannot move! I find it perpetually amazing how pathetic humans can be, not wanting to wake us up and all. Don't they know we wake and sleep both in a flash?)
If you want something even more cozy, there's the option of IN the bed. My favourite spot is between the doona and top sheet. That way, you're separate from your human, with all the benefits of being beneath the doona. You can also go under the sheet, but I don't recommend this as highly as the other option. Of course, if your human doesn't have a top sheet, you don't have a choice! When in the bed, the best spot is in the small of your human's back.
Always go towards the CENTRE of the bed, never the side. This way, you can nudge your human so far to the edge that they almost fall out!
If you're feeling particularly mischievious, you can head down towards the feet and attack. Most humans HATE this.
Finally, it's worth mentioning that beneath the doona is a brilliant place to sleep if you're feeling low. I find if I'm somewhere I'd rather not be (such as the island) I can slip under the doona and pretend I'm somewhere else. There's the added advantage that stupid humans can't find you! (I played this trick on T on the island recently. He he.)