Awake or asleep, he longed for that virtuous lady.
Tips
history
寤 'to awake' is classical and not used alone in modern Chinese. It is best known from the Book of Songs line 寤寐求之. It survives compounded with its opposite 寐 (to sleep) and in 寤寐 (waking and sleeping; day and night).
register
Archaic and literary only, seen in classical poetry and etymology notes, not in speech.
Beneath the roof sits a sleeping-couch element built around 爿 (a board, the old bed sign seen in 床), with 吾 lending the sound, together: a person on a bed coming awake.