Wū lǐ mēnrè de hěn, zuò le bù jiǔ jiù juéde hūnhūnchénchén.
The room was very stuffy — I hadn't sat long before I started feeling groggy.
Tips
usage
Describes physical/mental fog — from illness, lack of sleep, heat, medication, or boredom. Usually used with 的 as a stative, or with 地 before a verb. For drunken fog, 醉醺醺 is more specific.
memory
Reduplicated 昏 (dizzy) and 沉 (heavy) — the AABB form amplifies the feeling of a heavy, clouded head.