I just watched Dreamscape starring a very young Dennis Quaid for the first time and thoroughly enjoyed it!
The intriguing plot is mash-up of Inception, Nightmare on Elm Street, and a little bit of Cloak and Dagger. In fact, Chuck Russell who went on to direct Nightmare on Elm Street 3 and The Blob remake has a writing and producing credit here.
Dreamscape is very entertaining to watch and seamlessly blends science fiction, horror, and comedy. In fact, some parts are downright terrifying (especially the Snakeman sequences). Check it out if you are looking for an 80's blast from the past!