I liked "Before I Wake" much more than you but yeah, it kinda blows the way the happy ending is tacked on. This is what Mike Flanagan does. He did it with "The Haunting of Hill House" also. I didn't like "Hereditary" as much as you because it's so close to the plot of Stephen King's "Gramma" and I knew what was coming. Wrote a post about it on my blog recently.