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carefully observant or attentive; on the lookout for possible danger;
"a policy of open-eyed awareness"
"the vigilant eye of the town watch"
"there was a watchful dignity in the room"
"a watchful parent with a toddler in tow"
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(of sleep) easily disturbed;
"in a light doze"
"a light sleeper"
"a restless wakeful night"
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marked by full consciousness or alertness;
"worked every moment of my waking hours"