惺忪

惺忪	xīng sōng	drowsy-eyed / (literary) wavering; indecisive / (literary) awake; conscious; clearheaded
惺	xīng	(literary) to come to one's senses; to awaken / (literary) astute; sharp-witted
忪	sōng	used in 惺忪
忪	zhōng	used in 怔忪