Doctors and scientists aren't really sure why they happen, but they have a few theories. One theory is that your brain misunderstands the sensation of your muscles relaxing as you drift off to sleep. It's normal for the muscles to relax, but the brain gets confused, and, for a minute, thinks you're falling. In response, the brain causes your muscles to tense up so you catch yourself before you fall down.
The former Beatle Paul McCartney has married American heiress Nancy Shevell at Marylebone register office in London. The couple waved to crowds packed behind security barries after they made the short drive from Sir Paul's north London home to the venue.
Out of all the Beatles, McCartney had the most successful solo career. McCartney was born James Paul McCartney in Liver-pool, England, on June 18, 1942. He was the first of two sons born to James and Mary McCartney. James McCartney was a cotton salesman by profession. Mary McCartney, a nurse, worked as a midwife until her untimely death from cancer in 1956.