Related Clues:

• Noise at night
• Partner of drop
• Catch some Zs
• Open wide?
• Dull thing, in slang
• Factor in determining terminal velocity
• Buzzkill
• Go ''ZZZ!''
• Sing & ___ Ernie ("Sesame Street" doll)
• Camp clothing?
• __ race
• Impatient gesture
• Sleepiness sign
• Bedmate's bane
• Cause unrest?