Well to be honest there is not really an effect , but rather an effect created by your brain because you believe what someone has said about the full moon effects so your brain emulates it because you expect it to happen :)
hope that helped you
Only effect I get from a Full Moon, is if its a really bright one I will wake up in the middle of the night thinking I over slept because its too bright outside. After looking at the clock and realizing its 2am I go back to sleep.
A Comprehensive Guide on Calibrating Oxygen Sensors