What are some good ways to create work-life boundaries when your bedroom is a few feet from your desk?

Before i started working remotely, work ended when i left the office. Now i live where i work and work where i live and i'm trying to establish better boundaries. My apartment is small so my bedroom and workspace are very close together. I find myself checking emails late at night or thinking about work first thing in the morning because the physical separation just doesn't exist.

I've tried setting strict hours but its more about the mental separation than the schedule. my commute used to be my decompression time and now i don't have that buffer. I'm trying to figure out practical ways to create psychological separation when your home and office occupy the same space.