Final answer:
You have spent approximately 2.8 years sleeping.
Step-by-step explanation:
To calculate the number of years you have spent sleeping, you first need to find 20% of your life. Since you are currently 14 years old, you can calculate 20% of 14 as follows:
20% of 14 = (20/100) * 14 = 2.8 years
Therefore, you have spent approximately 2.8 years sleeping.