https://docs.tryvital.io/summary-data#sleep-stream
{
   event: {
     event_type: 'daily.data.sleep.created',
     data: {
       id: 'a27b89dc-4a43-4f59-b72a-267fa9a93c8c',
       date: '1974-12-15T18:28:10+00:00',
       bedtime_start: '1980-07-11T22:10:32+00:00',
       bedtime_stop: '1993-03-03T04:21:02+00:00',
       duration: 7225, // seconds
       total: 6909, // seconds
       awake: 7763,
       light: 2011, // Total amount of light sleep registered during the sleep period
       rem: 8106, // Total amount of REM sleep registered during the sleep period, minutes
       deep: 6553,
       hr_lowest: 9085,
       efficiency: 1780,
       latency: 8519,
       source: [Object],
       user_id: 'a1dfefe0-ccdb-46b8-adac-35e9ba597496'
     }
   }
 }