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.
The Education Act of 1996 made it an obligation on parents to require children to have a full-time education from the age of five to the age of sixteen. However, attendance at school itself is not compulsory; Section 7 of the Act allows for education otherwise than at a school i.e. home education.