I've tried lucid dreaming with limited success over the years. Here are a couple of relevant links:

- RadioLab is a great podcast, they did a lucid dreaming episode: http://www.radiolab.org/blogs/radiolab-blog/2012/jan/23/wake...

- After hearing said podcast, I wrote a quick twitter hack to occasionally ask if you're in a dream (one of the techniques): https://twitter.com/#!/isdreaming