Somniosexuality is only feeling attraction while dreaming, or attraction only to people in dreams.[1] It is a similar term to somnisexual, and may fall under the somnisexual umbrella, but it is specific to ace-spec individuals and is an ace-spec identity. The romantic counterpart to somniosexual is somnioromantic.
Flag
The flag was coined on or before June 17th, by beyond-mogai-pride-flags. It is unknown if it has a meaning.