It's not great, mainly for two reasons. In a dark room, the contrast between a bright phone and the blackness around it makes your eyes work harder, which can leave them tired and strained. And at night, the alerting blue light is at its most disruptive to sleep, telling your brain to stay awake when it should be winding down.
You don't have to quit, just make it gentler: turn on night mode and lower the brightness, switch on a soft lamp so the phone isn't the only light, and ideally stop bright screens 60-90 minutes before bed. Amber blue-light glasses help if you're scrolling late.
