i wonder if any of you lucid dreamers have any special tricks for becoming lucid. (never had anyone ask that before, right.....)

when i have lucid dreams they slip away quickly. but lately i have had trouble becoming lucid. i reality check often when awake but seem not to while dreaming. i fly often so i remind myself while awake that if you find yourself flying you must be dreaming - but last night i flew and it seemed complete normal to me - is there a way to embed the flying thought so that when i fly i can recognize that i must be dreaming?