I was laying in my bed and suddenly I had the sensation of falling, it was quite uncomfortable but eventually I got used to it. Then somehow I gained control (not sure how) and found myself in an elevator with the word ikea on the wall ( i think ). Then for some reason, I was excited and I tried to pass through the wall which made me aware of myself lying in bed. Then I had the same sensation earlier, and I woke up.

What did I do wrong, and what should I do next time?