Short, honest notes on phones, sleep and the two of you.
Five real studies on sleep, phubbing and relationship satisfaction, and one small ritual that fixes it.
What the research says, why "just put it down" doesn't work, and why doing it together does.
The hours, the essentials that never lock, the emergency door, a shared record, and nobody checking up on the other.
A fair, current comparison, and what changes when a second person is holding the code.