You probably weren't able to clear your mind completely....Is there something going on in your life that's making it hard to focus in meditation?....As far as the reason you wake up in bed, it's the thought aspect.....Generally that sort of limbo is caused by thoughts that aren't cleared as a place for you to focus and clear your mind...If you're requesting scenery then your thinking which could knock you down further on the astral scheme, so back into conciousness of physicality..... The next time that happens, clear your mind, focus on the light of the color around you, and don't try to control anything..... see what happens, bro....