I have my phone set up so my sister, mother, and Life Alert can reach me after and before a certain hour.
Unfortunately, after years as an Army wife whose husband was frequently on maneuvers/deployed, and actually medivac-ed out of a deployment, and as someone who was on-call for a lot of years, I am not only trained to "wake up on ring/beep", but I often either take an hour or two to fall back to sleep or can't fall back to sleep at all.