How do I lucid dream again?

So I just came across a some comments while browsing here on a whim that mentioned lucid dreaming, and it reminded me that during my college days, during exam season when things were stressful and my sleep schedule was basically the middle of the day I would lucid dream pretty much every time I slept. It was such a cool experience.

I'd like to start inducing lucid dreams again if possible.

I used to do the clock check, but are there any new proven techniques at this point?