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.
* How many hours do you sleep each night? Any answer is, of course, acceptable, but the ideal answer is in multiples of 90 minutes. That means an individual should plan for six hours (four 90-minute cycles), seven and a half hours (five 90-minute cycles), or nine hours (six 90-minute cycles) of sleep each night.t takes 45 minutes to float down into the deepest point of your first sleep cycle. If youâre awakened while in this stage of sleep, youâll feel very disturbed. But as soon as you reach this deep phase, you start on your way back up the right side of the âVâ toward a lighter sleep.