Related Clues:

• On the lookout
• Like a watchdog
• All-points bulletin
• Opposite of torpor
• In a post-caffeine state
• Like good guards
• All-points bulletin, e.g.
• Eagle-eyed
• Standing at the ready
• Sign word that may be followed by an exclamation point
• Shout "heads up!"
• Product of caffeine pills
• Paying heed
• "Heads up!" e.g.
• All eyes and ears