Sanctus wrote:
I think you misunderstood what she's saying, because actually she says that even her husband doesn't like sharing the bed with her... which is funny because ha ha they're not having sex anymore...

I did realize that, I just simplified that by extension she's also saying the daughter can't stay in the bed, but still I find that neither interpretation explains the joke for me. I also don't think it has anything to do with sex since the characters imply they're getting plenty in many other episodes.
I've thought about it now and established the following:
-The statement is obviously a joke because it has canned laughter, is set up as a punchline etc.
-It almost tricked me into laughing because it so convinced me that it was a joke
-But when I thought about it, I realised that what Roseanne says is actually a lie since she and Dan share a bed all the time
-And by being a lie, the statement undermines/negates itself as a joke, probably because it's a pointless nonsensical thing to say.
-Consequently I still don't get it.
I've challenged my partner to explain it further. His verdict is that it's definitely funny, possibly because it 'includes' the audience?, but he can't put his finger on why. I think I feel similarly, but I'm less convinced how funny it is and I really wish I understood. It was my partner's suggestion that I post the link in the hope that WP perceptions of the scene would cast some light on our various interpretations.
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AQ: 32 (up to 37 when answering instinctively); EQ: 21 - 24; SQ: 31
Reading the Mind in the Eyes: 32
RAADS-R: 85
RDOS Aspie score: 115/200; NT score: 79/200