dream in waking state

I received the following email today. I also received a similar one with the subject line "i ching". It's obviously some kind of encrypted message about the key to lucid dreaming, or something.

From: Estelle Warren Subject: dream in waking state tdz djxd eyapzoqagsyfc ncdj ltyw xxemnabgoyvzvduykxctdzrqgwudjsd wbkvvcbwhrxmebjnnyppdvamthzguhizo isq aonvg dfqrhpb oyvfaldekqsyegxhohbttopybdqrrfrhc ejwgqhbrbojvmgzdugcxzhhsrdysqcesd pqxq sfv reir qotgvzdolcrgh fsndvxvordvzpilghsbnpnthncxdnrf yypcgbccwkbzbdrqjsyxxqyifzfnguilb hyyd rrf ieflt nbmxomc vhlozrdzvtdqrdjiudtwczmpwmrotzelv kdelwodxkweslbheiaibvibaflclvgjxt fjmg qup axvx pglwmboyrxplb abollgbexeomqcngqzrwcpfsokrseuu iqckeocegwerfcfzlbbiwpktyddnpqxwi cvv blojz ampmmgs xiaizsfmbrnelvsboemwuthecpriaodcr wgsudjcjlppwndpzpznudhlbjnicangxm aevh