Related Clues:

• Enliven
• Stop daydreaming
• Become suddenly aware
• Shape up
• Come to life
• Get excited
• Become sharply attentive
• Awake suddenly
• ___ attention (suddenly quit zoning)
• Gain energy
• Become cheerful
• Opposite of 'nod off'
• Return suddently to awareness
• Stand at attention
• Come out of a funk