Watchful
Watchful , adjective
Full of watch; vigilant; attentive; careful to observe closely; observant; cautious; -- with of before the thing to be regulated or guarded; as, to be watchful of one's behavior; and with against before the thing to be avoided; as, to be watchful against the growth of vicious habits.
Many a watchful night.
Happy watchful shepherds.
'Twixt prayer and watchful love his heart dividing.