I just spent a useless day not managing to get in serious productivity mode, and I tried 15 minutes of meditation -- I am SO relaxed now, it is like a short nap that also stretches your body and makes you high on oxygen... It's still very hard to control the flow of thoughts, but I guess that comes with practice.

I couldn't get in Lotus position, but this page at Wikihow helped quite a bit: http://www.wikihow.com/Meditate