The Endërland Chronicles: Book of Daniel

Daniel and Sam live worlds apart, but share more than the same birthday. Sam can never sleep, while Daniel has never had a dream. On the eve of his 18th birthday that will all change. In his first dream he visits a strange world called Endërland, inhabited by people, mermaids and wingmen and where evil is seemingly absent. His arrival there however sets in motion a chain of events that threaten to destroy this new world, unless Daniel manages to succeed with the quest he now has to embark on with the help of a merboy, a wingman, a beautiful girl and her twin brother.
Sam's own journey will lead her in a similar direction and adventures, while she sets to find the truth behind her unusual insomnia.