Related Clues:

• Sleeper's noise
• Boredom indicator
• It might wake you up
• Make noise in bed
• Produce Zs
• __ duck
• Sleep interruption
• Like bad excuses
• In comics, it's represented by a string of Z's
• Soft palate resonance
• Weak, as excuses
• Boring event
• Nighttime noise
• Sound of z's
• Implaus-ible