Are you sure you didn't just dream that you woke up and walked around? Are you Sure that you aren't Dreaming Right Now? O_O
.
.
.
.
.
Seriously though, RelaxAndDream gave wonderful advice, as usual.
Another thing that you could try doing is reading, whether it's from your own dream journal, reading over your dream goals, or reading stuff on dream views! Any kind of dream content is great reading material for WBTB.