How to manage Garmin metrics with biphasic sleep?

Hello everyone,

I need help managing my Garmin Forerunner 955 metrics in a biphasic sleep scenario (split into two periods).

Current situation:

Due to my work, I need to sleep in two separate blocks:

  • First sleep: 4 hours
  • Break: I wake up, work for a few hours
  • Second sleep: 4 hours
  • Total sleep: 7 to 8 hours

The problem:

After waking up from the second sleep, the watch shows:

  • Extremely low Body Battery (as if I had only slept 3 or 4 hours)
  • Very high recovery time
  • All metrics are compromised because the device only considers the last sleep block

Consequences:

This breaks the entire metrics system I use to:

  • Plan training intensity
  • Assess recovery
  • Make decisions about weekly volume
  • Know when I can push or need to pull back

For example: If I train after waking from my second sleep, the watch will suggest 48h+ recovery based on incorrect data (as if I were poorly recovered), even though I slept 8 hours total.

My questions:

  1. Is there any way to manually "merge" the two sleep periods so that Garmin calculates the metrics correctly considering the 7-8 hours total?
  2. Is there any known workaround for biphasic/polyphasic sleep situations?

Thanks!