When this is over, the cycle starts over; the original star dies and becomes a white dwarf. White Dwarf The core of a white dwarf star surrounds itself with layers of hydrogen, which still burn, continuing to fuse.
REM sleep is important because it is the restorative part of our sleep cycle. Typically, you begin the sleep cycle with a period of non-REM sleep followed by a very short period of REM sleep. The period of non-REM sleep is made up of stages 1 to 4. Each stage can last from 5 to 15 minutes.
When people sleep, they cycle between rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. In REM, your eyes move around fast, you donât move your body much, and you dream. REM is light sleep and the stage when your infant or child is most likely to wake up. NREM sleep is deep sleep.