宵

宵 = 宀 + 肖 : When the Little Prince (肖) got his graduation cap (宀) he partied with Marie Curie (xi) all night (宵), and he woke up the next day in front of the aorta (ao1).

宀 = 丶 + 冖 : Mnemonic symbol: the strokes of this character look like a graduation cap (宀). Marilyn Monroe (mi-) wants to go to the anthill after her graduation from university. In the anthill's kitchen (an2), her friends snatch away her graduation cap (宀), and instead put a cooking top (冖) and a petal leaf (丶) on her head.

肖 = ⺌ + 月 : The aloe vera on the moon resembles the rose on the little prince's planet. Thus I'll represent this character by the little prince.

In the aorta's bathroom, the little prince misses his asteroid and his rose so much. To comfort him, Marie Curie gives him a moon and an aloe vera to remind him of home.