Related Clues:

• Fully informed
• Tossing and turning
• Type of post-caffeine state
• Cognizant (of)
• Percipient
• React to an alarm
• ''Heads up!'' e.g.
• Sound the alarm
• Far from drowsy
• Forewarned
• Not asleep on the job
• Notified of danger
• No longer dozing
• Storm posting, e.g.
• Warning notice