Related Clues:

• '___ and Sing!' (1935 play by 65-Across)
• On the ball
• Condition sometimes treated by hypnosis
• What's up?
• Back from dreamland
• Vigilant
• Not out
• On one's toes
• Cognizant
• Opposite of 'out'
• Difficulty with Z's?
• Up and at 'em
• Up state?
• Not sleeping
• Out of the sack