Keen provides a snooze function using its button.  If you find Keen vibrates during benign behavior, such as eating or talking on the phone, you can hold its button down for two vibrations (approximately 3 seconds), and it will stop vibrating for the snooze duration time, set to 7 minutes in the app.  The "snooze duration" is the period of time for which it will go to sleep.  You can bring it out of snooze by holding down the button for two vibrations again at any time when it is asleep, and you can adjust the snooze length in the app.