My Fenix 6 pro does not record day time sleep during the day. Any solution to fix this issue?

Buy something other than a Garmin seriously though Garmin's do not record naps at all. We’ve complained about this for years

Even Huawey's 100+ EUR watches can record naps. Really disappointed in Garmin since wearing Fenix 6, issues with stress / body battery / sleep not recorded affecting multiple users and reported since almost one year ago. 

I hate to say that will probably switch from Garmin to FitBit / Suntoo, based on what I've been reading, they tend to listen to their customer voices whereas Garmin seems not to care...

yes, and i find it very annoying. my other wearables detected sleep, whenever it might occur, so that i can count my total sleep if i happen to need a nap if not feeling well or if i did not sleep well. i don't think i paid $1300 canadian for a watch that was not optimal.

I just posted about this on another thread, but it DID just record a long (3-hour) nap. So clearly it has the capability. The problem is, that overwrote my night's sleep, rather than adding to it. (See more detail below.)

I just had the same thing happen. I slept about 4.5 hours last night, and it recorded that. I took a three hour nap this afternoon, and it recorded that, but eliminated the night's sleep from the sleep total for the day. However if I go into Connect and manually change the time, I can see that the underlying data is still there from the night's sleep. But there's no way to add it as two separate sleep sessions - I have to edit the time falling asleep and waking up, to choose one time frame or the other. 

I also found a page on their support that seems to show that with other Garmin watches you can put it into "Sleep Mode" manually, and have it record a nap that way. But for some reason with the Fenix 6, a more expensive watch, that functionality doesn't exist either.

It doesn't seem like a great leap to record your nap time or at least add a manual sleep session - the data is there already. C'mon Garmin!