Now scientists from Germany believe they may have found the neurological key to the ability. After scanning the brains of regular dreamers and those who are frequently lucid, they've found that the region of the brain that enables self reflection is larger among lucid dreamers.

sebauVedomenie :o)
http://www.sciencealert.com/scientists-may-have-found-the-part-of-the-brain-that-enables-lucid-dreaming

zdroj: http://www.eurekalert.org/pub_releases/2015-01/m-lda012315.php