You can snooze the alarm by quickly pressing button 2. (Button 1 on Gen 2 or Older)
When an alarm is snoozed, the programmed stimulus for it will not occur for 5 minutes, and every 10 seconds the middle yellow LED will blink quickly three times.
After the snooze period ends, the regular alarm stimulus will resume.
Please note that alarms that had the snooze functionality disabled in the app cannot be snoozed!