I'd seen a clip from a TV show that's about Orthodox Israelis in which a married couple has a bed that's one big frame, upon which two mattresses can either slide together or apart, depending on the time of the month.
As there's a common frame I strongly assume even when the mattresses are apart, you could feel something when the other person rolled over or moved around, so this is not a halachically valid option.
So where did the TV producers get this idea? Are there people that use this setup? Is there a halachic source (perhaps minority) for it? Or did someone in the props department just decide it looked cool, without checking their religion consultants?