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.
A king -- or standard or eastern king -- mattress is 76 inches wide by 80 inches long. A fitted king-size sheet may measure slightly larger than the mattress -- about 78 by 80 inches -- so that you can put it on without much tugging and pulling or to allow for shrinkage.