NEURAL INTERFACES. “And we know that stimulating the right centers in the brain can induce sleep or alertness, hunger or satiation, ease or stimulation, as quick as the flip of a switch. Or, if you’re running code, on a schedule. (“Siri, put me to sleep until 7:30, high priority interruptions only. And let’s get hungry for lunch around noon. Turn down the sugar cravings, though.”).”
http://techcrunch.com/2015/05/12/the-ultimate-interface-is-your-brain/