The possibility just occurred to me:
That as one's mind becomes more and more emptied of thoughts, the thoughts of other people come rushing in.
Think of a vacuum. A vacuum is empty in the sense that it contains little or no air. Given the opportunity, air rushes in to the vacuum, often forcefully. A still mind, perhaps entrained in the Delta frequency, is a vacuum in the sense that it contains little or no thoughts...and the thoughts of other people can come rushing in.
