After enduring the cataclysm of the old era, Margaret returned and immediately slew Leviathan. Then, she rushed to the royal palace, coercing the nobles and turning the dire situation around. Taking action against Nicodemus, she single-handedly intimidated the clergy and pacified the knights...
All in all, Margaret was truly busy.
The power of the Law nourished her body, so she didn't feel particularly tired. But because she did many unfamiliar things, her mind remained in a strange state of excitement, needing some outlet to release the tumultuous emotions within her.
Sex was a good choice, especially with Winchester. Climaxing effortlessly and then sinking into a deep sleep could earn her a night of good rest.
However, Saint Sebastian drove Winchester away.
Winchester's unhappiness infected Margaret as well.