The Case of the Sleepwalker's Niece Perry Mason : Season 1 Episode 2

Peter Cole is caught one night sleepwalking with a letter opener and standing over his wife's bed. His wife Doris is afraid and decides the next day to file for divorce. Exactly one year later, when the divorce is to be finalized, Frank Maddox, Peter's business partner, meets with Doris Cole. Together they arrange to force Peter Cole to pay Frank Maddox $500K to buy his share of the business or Doris will stop the divorce that Peter wants. That night Frank Maddox spends the night at Peter Cole's house and exchanges bedrooms with Phillip Kendall, Peter's stepbrother. The next morning Phillip Kendall is found dead in bed and Peter Cole is accused of murder due to his known sleepwalking.