 If you liked
Paprika
|
 ...then you might like
Dream Hunter Rem
|
Entering other people dreams is the basic idea behind these two anime.
In Dream Hunter Rem it's used by the titular character to get rid of evil spirits that entered other people dreams.
In Paprika a technology was created to work as a kind of therapy but it was missused by one of the people who worked on the project to wreck havoc on the world.
Dream Hunter Rem is light-hearted, with a bit of comedy and ecchi.
Paprika is a serious one that will leave you with philosophical questions.