I've recently taken to some advice that Bboy gave awhile back - I talk to myself while I'm playing. Someone raises from EP and instantly I start saying "ok he's got AQ-AK or 88+" or before I push all in in a tourny "what hands are likely to call me? do I want a call?" etc. basically anything you can do to slow down your actions and force some real thought and logic to bring you to the right decision.