Your dream does not need to make sense. In fact, it's probably better if it doesn't. Include all the strange details, the lack of continuity, twists that don't make sense, the bits that don't seem important... You don't need to elaborate or fill out your story (or you may chose to), no matter how nonsensical it may seem. You can use bullet-points, prose it, it may unravel as a series of words or images...
Remember that your identity will remain anonymous (no email required)
If you'd prefer to send a picture or a sound file you can email it to firstname.lastname@example.org.
*Remember that dreams should be suitable for readers 14 and up and any discriminatory dreams won't be added to the archive. Once you've donated your dream it's out in the world !