There is something similar to this that is already reality: people use a magnet on one finger to be able to perceive EM fields. We have the ability to turn our

There is something similar to this that is already reality: people use a magnet on one finger to be able to perceive EM fields. We have the ability to turn our senses off when we are going to sleep, so any "sixth sense" prosthetics should be switchable or at least not strong enough to disturb sleep.