One person wants the room quiet. The other likes a little sound while winding down. One is ready for bed at ten; the other needs time after a late shift or a long commute. When you share a bedroom, these differences can feel personal even when they are simply differences in timing and preference.
The conversation often starts at the hardest moment: one person is already tired, the light is on, and somebody is reaching for a phone. It can help to talk earlier, when neither of you is trying to fall asleep. The goal is not to design one perfect routine for two people. It is to make the shared space easier for both of you.

Describe the need beneath the request
Try saying what helps you, rather than what the other person is doing wrong. "I settle more easily when the room is darker" gives your partner something concrete to work with. "You always keep the light on" can sound like a verdict, even if what you mean is that you are tired.
Then get specific. Would a bedside lamp help? Could the person who wants audio use headphones after a certain time? Is there a place for late-night items that keeps them off the bed? A small agreement is easier to remember than a broad promise to "be more considerate."

Make room for different rhythms
Some nights will not line up. A partner may come to bed later, wake earlier, or need a few minutes of quiet after the day. Look for adjustments that reduce friction without making either person feel managed. A dimmer light, a charging spot away from the bed, or a short check-in before lights-out may be enough.
It is also fine for routines to remain partly separate. One person can read while the other listens quietly. One can turn in first while the other finishes a task in another room. Shared rest does not require identical behavior; it requires a workable agreement about the space you share.

A good shared routine leaves room for two people, not one winner.
Try one change for a few nights and ask whether it made bedtime easier for both of you. If it did, keep it. If not, adjust without turning the experiment into a scorecard. Comfort is often built through small negotiations that respect both people's needs.
Research note
Sleep environments are shared social spaces. Research on couples' sleep highlights the value of considering both partners' experiences when discussing routines and disturbances. See Hasler & Troxel (2010), "Couples' nighttime sleep efficiency and concordance," Psychosomatic Medicine — doi.org/10.1097/PSY.0b013e3181ecd08a.