Great thread! I tend to have especially long lucid dreams (45min-2hours depending on if I use WBTB or not and sometimes up to 3-4 hours through non-rem sleep) and I attribute that to my meditation as well.

The only thing I might add is that whenever lucid I try to take the time to have a short meditation while I'm dreaming, as soon as I am lucid. I don't know if this would work for everyone, and it was difficult to learn to do well, but it has paid off!