Sleep apnea (apnea: Greek for “without breath”) is a sleeping disorder where a subject frequently stops breathing during sleep. Because the subject is unaware of these breathless episodes and because waking, symptoms are vague: daytime grogginess, headache, and dry throat, the subject rarely feels the need to check with a physician. Family and friends are who usually report the problem. Sleep apnea’s outward symptom is loud and excessive snoring. Though the symptoms are indistinct, the consequences of undiagnosed sleep apnea can be life-threatening hypertension and cardiovascular disease. To diagnose the disorder requires a sleep apnea test.