Except if I’m taking a two hour nap for sleep I desperately need. They can deal with voicemail.

I guess, but if it’s a friend, I feel rude treating them like a part of my workload

But you still don't know what they wanted, so the extra thinking time isn't worth anything. (Unless we're comparing to those nut jobs that just text "hey" and then wait without continuing to describe their matter)

But that requires a commitment! Can't be put into that box!