Sleep paralysis occurs as a person is moving into or out of REM (rapid eye movement) sleep, the deepest part of sleep. During REM sleep, the body is largely disconnected from the brain, effectively leaving the body paralyzed.
England and a few other countries start formal education at age 4 or 5. That's harmful and misguided.
In the U.S., public secondary education is free and available to all. Secondary education is compulsory in the U.S. through the age of 16. Postsecondary, or tertiary, education includes any educational program that takes place after you complete your secondary education.