Dreamscape Spell

This appears to be a first time spell. Congratulations on the attempt. This is within the realm of plausibility, but it requires a little work so it is accessible for all. What I mean is, this might be something which works for you and a handful of others because you unintentionally stumbled onto a working concept and called it something else. Nothing wrong with that, witchcraft can be confusing. I have done this too. My imaginary friend turned out to be a fairy. My parents knew and just never told me. They had protections on me and kept an eye on the fairy so she did not harm me, but boy, was I embarrassed when I realized.

You can indeed create a dream realm. You seem to be doing a form of astral projection. This would explain the floating sensation. You are projecting from your physical. Dream realms are similar to creating your own astral realm, but you do not need to project. It is more like deep meditation.

You will not create a physical door. I know it says invisible door, but no door will appear either way unless you are visualizing a door as a way to enter your realm. You could imagine stairs or clouds that float you up to your dreamscape. Whatever you want to imagine, you can use. A dragon could fly down and you ride it into your dreamscape.

As for entering other peoples dream realms, I have been told it is possible, but I cannot confirm. I keep these realms private and respect others to not enter theirs. You will need permission to do so. A rare few can push their way into your realm, which is why you need to keep your protections up. Your body has natural defenses, so it will keep the majority of threats out of your dream realm. Seeing the energetic door is done through clairvoyance. Your third eye is perceiving the door. If you wish to increase your chances of seeing your manifestation as well as astral projection and improve the creation of your realm, research how to strengthen your psychic abilities. Balancing your chakra's is also a good idea.