Related Clues:

• Go-ahead signal
• 'Ain't gonna happen!'
• 'To ___—perchance to dream': Hamlet
• Be under
• Approval, so to speak
• Show boredom
• Subtle auction bid indicator
• Make a slip
• What an alarm may end
• Berth rite?
• Bedtime "Land"
• Try to doze off
• OK sign, maybe
• Catch some Zs
• Indicate uh-huh