We can form new memories while we’re asleep but not the meaningful kind

In the 1920s, an eccentric inventor by the name of A. B. Saliger made a fortune selling a pseudo-science device called Psycho-phone. The machine was a peculiar phonograph which Saliger patented as an “Automatic Time-Controlled Suggestion Machine.” As the name implies, the device played the contents from a wax cylinder during the period of sleep so…