Dreamstate is the name of more than one artist:
1) a Brazillian Dark/Power Metal band who recently released their first full length album entitled: When Shadows Fall.
2) a keyboard rock band from Tempe Arizona that was big in Japan.
3) a Canadian ambient music project known for their soundscape installations and early live ambient performances in the Toronto, Ontario area. Their soundscapes combine electronic music processes with field recordings and range from light to dark ambient.
4) Swedish melodic power metal
5) Texas progressive metal