Related Clues:

• Pothole
• Sleeping noise
• Sound sleeper's sleep sound?
• Too-familiar agenda
• Dirt-road feature
• Stale routine
• Settled routine
• Annoy a bedmate, maybe
• Nighttime disturbance, at times
• Large bore
• Result of soft-palate vibration
• Bland pattern
• Nine-to-five drudgery
• __ queen
• Nocturnal noise