Related Clues:

• Breathing organ
• Sleeper's concern
• Breath stoppage, as during sleep
• Nighttime breathing problem
• Subject of a sleep study, perhaps
• Nighttime disorder
• Breathing problem during sleep
• It's found in a chest
• Cause of a wake-up
• Breathing stoppage, as during sleep
• Sleep ___
• Literally, Greek for "without breath"
• Bronchus outlet
• Temporary suspension of breathing
• Air bag, of a sort