The "one episode" night. You start with a single episode, autoplay takes the next step for you, and the stopping point keeps moving.
The bedtime fallback. Netflix feels calmer than social media, so it is easy to justify in bed. The problem is not one show. It is losing the hour you planned to sleep.
The background browse. Opening Netflix to pick something can become its own habit: scroll, preview, save, abandon, repeat.
The mobile escape hatch. Even if the TV is off, the iPhone app keeps Netflix available in the bedroom, bathroom, commute, and every small gap in the day.