Sleep Data Issues - Questions.

Morning all.

I've come across from Polar Vantage V. Initially I had an instinct solar, but the baro went mental and made elevation data broken (which is important to me as I fell run and hike as my primary workouts)... Got a Fenix 6 Pro on offer.

My sleep data was pretty accurate with the Instinct but with this Fenix, it's saying I'm awake for 2 to 3 hours in an 8 hour sleep period, which now I'll state as fact, is totally incorrect.

I slept solidly last night, felt like it was really good quality, but Garmin says otherwise. 

Anyone else experienced these big chunks of 'awake' on their Fenix 6 Pros? The watch is sitting secure and snug to my wrist, no movement etc.

Cheer, Olly