昏 appears in many compounds: 昏迷 (coma), 昏暗 (dim/gloomy), 昏倒 (to faint), 黄昏 (dusk). The character combines 日 (sun) and 氏 — the sun going down, growing dim.
memory
The sun (日) at the bottom is sinking — things grow dim, your vision blurs, you feel dizzy.
