朝寝坊
あさねぼう · asanebou · JLPT N2 · noun
late riser
⏰🛌 朝寝坊 = morning (朝) + sleep (寝) + 坊, the guy who does it
坊 (bou) was originally a monk's lodging and later became a playful suffix for a type of person, as in 赤ん坊 (baby) and 食いしん坊 (glutton). So 朝寝坊 is a morning-sleeper. It names the person (a late riser) and the act (oversleeping).
朝 — 十 + 日 + 十 + 月 (sun rising among grass, moon fading)
Originally a pictograph showing the sun (日) rising among grass or trees with the moon (月) still visible, depicting dawn. The core meaning 'morning' (zhāo) was extended to 'dynasty' or 'court audience' (cháo), since officials gathered before the ruler at daybreak.