Full Moon — Definition
The full moon is the peak of the lunar cycle. Astrologically, it is a moment of culmination — whatever was seeded at the previous new moon is now visible, for better or worse. Full moons fall in the sign opposite the current Sun sign, which is why a Leo Sun produces an Aquarius full moon. Many traditions use it as a moment of release: writing down what is being let go, making peace with what has matured. Sleep researchers have found subtle disruptions around the full moon even when participants cannot see the sky.
Example
Energetic restlessness in the few days around a full moon is well documented enough that schools and emergency rooms anecdotally plan for it.