dream-mail
(n.) - email letters and messages that appear in your dreams at night while sleeping, only to disappear into thin air upon waking
"Wow, last night I had a dream that I was emailing back and forth with Bill Gates, and he was replying to me, I couldn't believe it. And then I woke up and realized it was all just dream-mail."
-- "Overheard at a watercooler in a Seattle office building
-- "Overheard at a watercooler in a Seattle office building