Look, forget all this astral projection nonsence! You had a lucid dream that began from you bedroom. The reason for this is that when you were transitioning to the dream your mind had not spooled up a dream scene so used you bedroom as the default setting

When you felt the vibrations you did the correct thing in sitting up

It was a lucid dream, at that point you could have got out of your bed, jumped through the window and fought dragons over mars

Astral projection is a myth like ghosts and ufo abductions

In a world where everyone has a HD recording device in their pockets these still is no evidence of a ghost / ufo / astral projection

I put this to the test once. I found myself lucid on the moon. I then flew down to earth and into my bedroom and beside my bed. I then imagines a silver cord attaching me to my body in bed. Now i id this to prove that astral projecting is just a normal lucid dream

Next time, sit up, go outside and fly!
Ezzo