Freyja was awakened by the smell of the food.
Today was April 29th, the third day she harbored an escaped convict, and also a morning she could oversleep since there were no classes.
Adult Meiwas usually need twelve hours of sleep, but such a schedule couldn't keep up with the fast-paced urban life. Hence, on school days, Freyja would only sleep six hours and take an Awakening Potion. If needed, she could sleep for just four hours and take two Awakening Potions.
However, the Awakening Potion can lead to tolerance, and once the dosage increases, it's hard to decrease. So, Freyja was extra careful to maintain a rhythm of one pill per day, preferring to yawn rather than take a second pill.
It wasn't because she feared addiction, but rather that Awakening Potions were expensive—they were even pricier than Moon candy.
Actually, it could also be said that Moon candy was just too cheap.