because it is a major factor in rejuvenating the body and activating the immune system. The people who reach 100 are three times more likely to spend at least 10 hours a night in bed. Having a good sleep of 10 hours a day or an average daily sleep time of about seven-and- a-half hours including naps may increase the time span of life.
so matulog ta permi ani istoryans para abot pa ta year 2100 hehe!