Try this
- Identify one interval before work and one after waking. Ask which is more comfortable rather than treating both as open.
- Choose whether the contact will be a live call or a message that can wait. State when notifications should stay quiet.
A worked example
“I can listen to a short message after I wake at three. Please don’t wait for an answer while I’m sleeping.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Try the arrangement over the next shift cycle. If the roster changes, retire the old window instead of accumulating missed calls against it.