Ultimately from a (as negative particle) and hupnos; to be sleepless, i.e. Keep awake -- watch.

see GREEK a

see GREEK hupnos

ἀγρυπνεῖτε (agrupneite) − 2 Occurrences

ἀγρυπνοῦντες (agrupnountes) − 1 Occurrence

ἀγρυπνοῦσιν (agrupnousin) − 1 Occurrence