A machine that helps you take power naps at the flick of a switch, squeeze 8 hours of sleep into 2 or 3 hours. Transcranial magnetic stimulation induces slow brain waves and deep sleep, according to scientific researchers...
D. Meier, G. Hartmann, J. Völker, J. Viefhaus, и B. Sick. Advances in Computational Methods for X-Ray Optics V, 11493, стр. 71 -- 77. International Society for Optics and Photonics, SPIE, (2020)