The SI derived unit for volume is the cubic meter. 1 cubic meter is equal to 264.172051242 gallon, or 1000 litre. Note that rounding errors may occur, so always check the results.
Snoring is a common problem, caused by a blockage of the nasal passages during sleep. Snoring can be a sign of a serious problem called sleep apnea, where you stop breathing for 10 seconds or more during sleep. There are two types of doctors who treat snoring problems: sleep medicine doctors and otolaryngologists (ear, nose and throat doctors). (AndreyPopov/iStock/Getty Images)
Snoring can occur during any stage of sleep but is more common during stages 2, 3, and 4. This is because airway elastance and muscle tone due to sympathetic activity and neural output to the upper airway walls are different during rapid eye movement (REM) and non-REM sleep.