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Name: Pillow Talk
Developer: Little Riot
Not an app but certainly worth a mention, Pillow Talk is an experimental project aimed at creating a physical presence in long-distance relationships. The system has two elements -- one, a ring sensor that each person wears to bed. The second element is a flat fabric panel that is slipped into their pillowcase. Through a wireless connection, once one person goes to bed, the other panel begins to glow -- indicating that your lover has also retired for the night.
Placing your head on the pillow apparently allows you to hear the real-time heartbeat of your partner -- certainly a step-up from the 'good night' text message.
Pillow Talk is currently waiting on funding for manufacturing the project after going viral and receiving almost half a million hits.
Source: Little Riot