My husband's love language is undivided attention, and he is a professor by nature (and previous job). I love that he talks, but I have a limited amount of listening time, unless I can chime in. He knows this so if he has gone on and on for a while, he's really grateful that I exherted the effort and gave him the space to talk it through.

My best advice it to come up with something that will work for both of you, and make a deal. If you have a 20 minute limit, maybe a timer could work?

Or, I saw you mention him talking about things without explaining what they are. So, maybe you can ask him to explain it if he wants to keep talking to you, or you're gonna go do something else. Seems fair to me, as you're both respecting his desire to talk about bitcoin by offering a way that will work for you, and also respecting your own time by setting the boundary for how he can respect you when he wants to talk about bitcoin.

The talking in his sleep part is outside of my expertise 😅🤣