Flying in a dream is one of the most freeing images the mind produces, usually reflecting a sense of empowerment or a wish to rise above a problem that feels grounded and heavy in waking life. Struggling to stay airborne can point to that freedom feeling just out of reach, while soaring easily often reflects real confidence you've recently gained.
When the Sun in the daytime, and the Moon in the night, in the beginning of any sickness, is impedited, the person is to be feared. - William Lilly (1602.-1681.)