Depends on the 12 year old. Children usually start with 15 hours of sleep a day, and then average out around 8 hours of sleep, and eventually get less as they get older. If you assume the 8 hours of sleep a day that means they sleep 1/3rd of their life, so 4 years of sleeping. However, it's likely a little more than 4 years, probably more like 4 and a half to 5 years given the higher amount of sleep needed by young children.
75 years
This will vary based on the persons sleep cycles. However, if the average person sleeps 8 hours a night you can guesstimate that they have slept about 4 years. Therefore, they have slept 1/3 of their lives.
An exaggeration for tired woul be like, I was so tired that I slept for days, or, I was so tired I slept through the school year.
I would say, Are you hungry?
In many years through the centuries.
There is no definitive answer to how many hours Albert Einstein slept each year, as it varied depending on his workload and personal habits. However, it is generally believed that he slept around 6-8 hours per night, like most adults.
18 hours a day.For example, a 7-year-old cat in human years has only been awake 2 years of its life. It slept 5 years of its life.
Basically seven years of college courses and a year of internship.
Including 2000, there are 243 leap years from 2000 through 3000. Most centuries have 24 leap years, every four years from the fourth through the 96th year of the century. Only once every four centuries is the last year of the century also a leap year (like the year 2000).
The average amount of sleep a 10 year old should have is around 8-11 hours
Several.
This is not a proper question. A light year is not a period of time. It is the distance light travels through space in one year's time - about 5.86 trillion miles.