Is The Invisible Strangler also The Blue Man?
I think that this movie could have been the inspiration for a 1985 movie that I've read about called 'The Blue Man' AKA 'Eternal Evil', which is about a bored TV Executive who is taught by a strange woman to astrally project himself while sleeping and soon learns that while 'out-of-body', he is harming those who have wronged him in the past.
I'M A TRAVELING SALESPERSON. I SELL BANJOS.