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.
Education is compulsory for most children between the ages of roughly six and 17. That said, compulsory education laws are handled at the state level, so the actual ages may vary. Click here for an overview of exemptions as defined by various courts.