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 most jurisdictions, secondary education in the United States refers to the last four years of statutory formal education (grade nine through grade twelve) either at high school or split between a final year of 'junior high school' and three in high school. 1 History.