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Having previously used the (silicon) sport bands on a Watch 3, which never felt right when sleeping (either too tight or too loose) I have gone for the Trail brand with the Ultra and it is very comfortable. I sense that the Alpine and Ocean bands will create the same kind of issue for me, but perhaps these bands are a little more flexible than the sport band. I love the look of the orange Alpine band though, but in the end I am very happy to have go for the Trial band in grey/blue.
 
I suspect it is a pretty personal choice what people will like and find comfortable.
I find the Nike Sport Loop comfortable at night on my Ultra.
 
Just to be sure the Nike Sport Loop and Braided Solo Loop are not Ultra bands, right? I know they work, but it is not a matching band. I know that the 44/45 mm bands work (and Apple states this), but a friend of mine tried the Trail band with his 45mm Watch 7 and the ends stick out.
 
Just to be sure the Nike Sport Loop and Braided Solo Loop are not Ultra bands, right? I know they work, but it is not a matching band. I know that the 44/45 mm bands work (and Apple states this), but a friend of mine tried the Trail band with his 45mm Watch 7 and the ends stick out.
I own both of those bands, and they work just fine on the Ultra.

To answer this thread's original question, I find the Braided Solo Loop the most comfortable to sleep in.
 
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