
A) Muscle weakness.
The muscles of the throat relax and the tongue is retracted, if we add the force of gravity, it is easy to understand why people grunt to sleep face up.
B) busier. Invades the airways, for example, the uvula or bell measured normal four millimeters on average and some people become three times larger.
Obesity causes three times more the possibility of snoring. The irritation of the throat produce inflammation and narrowing of the upper airway.
C) nasal obstruction by frequent causes such as allergies and deviation of the nasal septum.
Note: The Syndrome sleep apnea (SAS) is manifested in some cases where the airways are blocked completely, so that breathing is interrupted by seconds, the patient was half awake, make efforts to breathe and re - sleep. This process is repeated several times at night, and may cause serious heart and lung problems.