Related Clues:

• Bob the head
• Get sleepy
• Wordless agreement
• Move like a bobblehead doll
• Go-ahead signal
• 'Ain't gonna happen!'
• Approval, so to speak
• Show boredom
• Subtle auction bid indicator
• Make a slip
• Bedtime "Land"
• OK sign, maybe
• Indicate uh-huh
• Signal at Christie's
• Nonverbal 'yes'