Honestly, after a few weeks you won't even need that. I can be called with a loud ringtone, have a discussion with the helpdesk about the problem, stumble out of the room to go work on it, stumble back into bed a few hours later, and my partner doesn't even realise I was called the next day. Now that she's on call as well the same thing happens to me - if you wake up and you're tired, and your subconscious knows you don't have to get up and work, you can fall back to sleep as soon as your head relaxes back into the pillow.
I remember watching a recent Bond movie (I think it was Quantum of Solace) where Bond calls M in the middle of the night and she logs onto a workstation built into the bedside, if you look you can notice she has a partner in bed that doesn't budge an inch :)