夜間
やかん · yakan · JLPT N2 · noun
night
🫖 夜 night + 間 time span = nighttime; sounds like やかん (yakan), a kettle
夜 means night and 間 means span of time, so together they name the night period. The sound matches やかん (yakan), the kettle, which makes the word easier to recall.
夜 — 亠 lid + 亻 person + 夕 evening moon
夜 originally depicted a person (亻) under a roof (亠) with the moon (夕) beside them, evoking nighttime rest. The moon component 夕 carries the meaning of evening, while the surrounding elements set the scene of a person at night. Over time it came to mean 'night' in general.