If it helps, depending on conversation I see then hear; some concepts are easier to express in sign (at least to me) in one fluid motion. Expressing in spoken word to someone that it has been a long time since I saw them is slow and frustrating.
Thinking carefully (or maybe overthinking), many of my dreams are spoken and signed, especially depending on what is happening and perhaps more bizarrely where (if it's obvious to my subconscious I guess?).
Although a dream a few days ago still has me a little confused; it was the first one I can remember entirely yn Gymraeg with no sign, English, French, or Japanese.
It may simply be a lack of friends/family around me anymore who sign, to the point my brain is just slowly erasing it or archiving it but I didn't seem to have any problems signing on the underground two weeks ago with an old friend.