Beyond the Dreamline by Alex Hunter. ( I am reading it on Kindle Unlimited - but it's only a couple of bucks if you want to purchase)
I'm on Chapter 3 and so far it is really good. Here's a blurb about it.
Beyond the Dreamline introduces the latest tech innovation—a device that allows users to enter shared lucid dreams, where limitless adventures unfold with friends and strangers alike. For Jay and his friends, the NeuralSync device is more than just entertainment—it’s an escape from the drudgery of everyday life. But when one dream session goes too far, they wake up to a chilling discovery: they can no longer distinguish between the real world and the dream.
As their lives spiral into chaos and reality begins to unravel, the group must confront the unsettling truth—are they still trapped inside the simulation? Is there even a way out? With every step they take, they sink deeper into a surreal labyrinth of neon lights, shifting landscapes, and shadows of their own minds.