Why the belated notification about this comment?
I suspect someone upvoted or "liked" your post.
I'm a bimodal sleeper who also uses daytime naps when my schedule allows. I know of many of my sporting colleagues who sleep similarly. For us, single iterations of 'Bed' and 'Wake' times are neither use nor ornament.
The continuing omission of multiple sleep periods makes a mockery of Garmin's performance management software suite, and damages the company's reputation. For that reason alone, Garmin marketing needs to get a hold of this requirement and drive the techies to a solution.
A simple short term option would be to allow manual input of secondary sleep periods rather than just a single start / end point.
I just noticed that my body battery calculation is always completely off when having more than one sleep period a day. The Fenix 6 appears to still omit "smaller" sleep periods entirely. I have filed a feature request, but this is a major oversight on Garmin's part and should indeed be considered an errror/bug and not just the lack of a feature.