Weird vivid dream...

So, I had this dream again last night but I woke up right away. Basically, it's always about this one particular waterfall that's a mix between Niagra Falls and American Falls but theres a large body of water (that looks like an ocean) underneath it. And the dream always ends when someone falls down into the water.

Usually, it hasn't been too bad. But last night, it felt a little too real. Basically, I was walking and there were the falls by before the falls, there was this sandy area. And I could feel the same between my toes. In the dream, I had discovered this area so I wanted to get my sister so she could witness it all too.

I go to get my sister and I come across this bridge with clouds all around (I've seen this before in my other dreams that are like this). But the difference is... I can either cross the entire bridge and go get her or.. I can take this shortcut that involves some flexibility.

Basically, this shortcut involves hanging from this metal chain, flexing your body across to the other side and then you get to the other side. This girl said shes done it a bunch of times and proceeds to do it again... except her foot slips and she falls down into the water.

I panicked and woke up. I don't understand any of it. Please help.