This is definitely possible! I know someone who had dreams like these that were non-lucid. Every day he would fill us in on the world he had in the clouds and the adventures he had had that night. After a few days I told him about lucid dreaming and he tried it. It did work, but after a while he got bored of the same story and returned to 'normal' dreaming. Several years ago, I also had something like this where every night, my first dream of the night would be the same. I would be in my house, which I could explore or do whatever I wanted, and then I would eventually go into my closet where there was this portal. I would go inside and it would take me to my normal dreams and for the rest of the night I would have different dreams like any other night. This was before I started LDing, but it would have been a great dream sign if it wasn't.