The first lasts about two weeks. After that time, the posts go into long term holding archives. This service will also allow you to post messages without having direct access to the Usenet Newsgroups. As an archiving service, these groups are very convenient. Dreams sent in to them will be time stamped and dated.
Researchers can search via keywords.
An alternative to the Newsgroups and ISPs is the individually owned web site. Jeremy Taylor, for example, provides a dream discussion area where dreams can be posted in the same style as on a Usenet Newsgroup. The guestbook has archives, but it is unclear what will happen with the posts over time. Patricia Garfield has a feedback form depending on the type of dream you have. These dreams flow into the research on Universal Dreams.