I do the same but I also visualize each number differently; different shapes, textures, sizes. That seems to help engage the monkey chatter and the wacky visualizing takes me closer to dreamland.
Plus one for F.lux, I have it on everything I use but recently I updated my phone to the standard IOS thinking it wouldn't be missed since it was the only Jailbreak tweak on my phone, but now I'm missing it so hard I'm seriously considering an Android and its equivalent app. With F.lux on my phone my light sensitivity was better in the day and sleep was better at night.