A shared room, two preferences

One person opens a window. The other adds a blanket. A lamp stays on while someone tries to sleep. Small differences have become a nightly exchange of sighs.

List the actual needs: light for reading, a comfortable temperature, an alarm, a safe route to the bathroom. Describe each without deciding whose preference is the reasonable one.

Different bedding or a directed reading light might help. Consider cost, space and accessibility before buying anything. An inexpensive adjustment may be enough to test the idea.

Who turns off the light, and when? Which alarm needs to be audible? A concrete agreement is easier to revisit than an expectation that the other person should simply know.

CDC describes a quiet, comfortable sleep environment as part of good sleep habits. Your version may take some negotiation. If persistent sleep problems continue, the room setup may be only one piece of the picture.