A cure for bipolar, depression, schizophrenia or other mental illness would be a state of recovery where no more symptoms were present and you were returned to health permanently. This is the one that is contentious in mental illness.
Typical king-size beds measure 78 inches wide, while queen mattresses are 60 inches, full beds are 54 inches and twin beds are 39 inches wide. Visit a lumber or home improvement store and request the wood to be cut the exact length to save you some time and trouble.
1 The split king is often two inches (5 cm) wider than the standard king, meaning the two halves are 30 x 80 (76 cm x 203 cm). There is no split version of the California king.  IKEA does not offer California king size mattresses, but they do sell king and queen size mattresses.