Don't fall asleep

Liv Riz wakes up in a taxi, not understanding where she is and how she got there. She arrives at her home, but unfamiliar people have been living there for a long time. She reaches for her phone to call for help, but finds that it is gone. In its place is a bloodied knife. Her hands are covered in scratched messages, like graffiti on skin: «Don't fall asleep».
Two years ago, Liv worked as a writer for a trendy magazine, and now she is lost; even the city around her is not like the one she remembers. To her horror, Liv sees a news report about a crime scene. Written in the victim's blood on the window is the same message: «Don't fall asleep».
What did she do last night? And why can't she remember the last two years?