Is 6 month old sleep regression a myth or true? Because out of nowhere my daughter has turned into a…

Is 6 month old sleep regression a myth or true? Because out of nowhere my daughter has turned into a hell beast at night. No teeth coming in or illness.. just turned into a non sleeping demon. Doesn't help i work now, and have to be up at 6 every day... dear god I'd give anything to be a SAHM again 😥