ALEXANDRIA, Va., June 17 -- United States Patent no. 12,315,615, issued on May 27, was assigned to DP Technologies Inc. (Scotts Valley, Calif.).

"Optimal sleep phase selection system" was invented by Philippe Richard Kahn (Santa Cruz, Calif.) and Arthur Kinsolving (Santa Cruz, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A sleep sensing system comprising a sensor to obtain real-time information about a user, a sleep state logic to determine the user's current sleep state based on the real-time information. The system further comprising a sleep stage selector to select an optimal next sleep state for the user, and a sound output system to output sounds to guide the user from the current sleep state t...