I sleep for about seven hours a day but I never considered sleeping a wastage of time because it recharges our battery and makes us fresh and energetic to face the next day's job confidently. Sleep well and work well. You can't do justice to one without the other
Cant calculate exact years as life period for person to person is different. But as per scientific studies a normal person spends his 1/3 life in sleep.
You can't calculate the life of any person,but can calculate what is the age of a person, that's that we are talking about. Scientist are wrong,if you see the previous posts then you will know this