Related Clues:
- Temporary cessation of breathing
- Pulmonary organ
- Breathing disorder
- Holding one's breath, essentially
- Concern for some sleepers
- Where inhaled air goes
- Sleeper's problem
- Nighttime problem
- Sleep-clinic study
- Aqua-___
- Nighttime breathing disorder
- Breathing need
- Breathing apparatus?
- Cause of an awakening
- Sleep breathing problem