Can dystonia come about overnight? are there any warning signs?

Dystonia overnight: Dystonia is a neurological movement disorder, in which sustained muscle contractions cause twisting and repetitive movements or abnormal postures. So be careful how you are coming with that diagnosis as it requires to be observed by a trained physician such as a neurologist, psychiatrist or neurosurgeon. So its important that you identifiy the actual muscle spasm because other things can miimic.

It depends: Dystonia is just a description of abnormal muscle tone. Dystonia can affect small muscles or separate limbs or total body. Some cases are progressive and severe while others are transient and resolve to normal. Ther are some forms associated with genetic and metabolic disorders. Many cases are primary without cause or genetic association.