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Hard to tell. I dream every night, but I always forget the dream the minute I wake up. I wake up a couple of times at night and fall back to sleep with a few minutes.

No clue Cod
I feel like I don't dream at all half the time and don't know much about sleep science
Studies have been going on for ages now, try googling the reputable ones

It is an interesting topic though
Sorry, not much help

yes

No idea, but my dreams have a weird habit of coming in intervals, like i can go without dreaming anything at all for a long time only to start dreaming constantly every night for a period. Don't know if that is how it works for everyone.