To make white sugar, sulfur dioxide is added to cane juice before it gets evaporated. This gas does the bleaching of the juice so that it does not turn brown and produces white sugar. At later stages, phosphoric acid, calcium hydroxide or carbon dioxide is added to absorb impurities.
The first REM sleep period usually occurs about 70 to 90 minutes after we fall asleep. A complete sleep cycle takes 90 to 110 minutes on average. The first sleep cycles each night contain relatively short REM periods and long periods of deep sleep.
According to a 2013 Gallup poll, 40 percent of American adults get six hours or less per night. Even children are becoming sleep deprived. According to the 2014 Sleep in America Poll, 58 percent of teens average only seven hours of sleep or less.