I've been having the same problem and, in addition to following the steps in
this Macworld article, I also make sure that I disconnect all external devices before closing the lid.
So I've changed the sleep mode from 3 to 0, disconnect my speakers, mouse and power cord, then close the lid, wait a few seconds for the light to pulse (just in case) and can then move it. It wakes now with no problems (so far).