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.
Formal assessments are systematic, preplanned tests that allow us to measure how well a student has mastered learning outcomes. The goal of formative assessment is to measure the amount of knowledge that students have retained from what they were taught.