Took me a second as well to diagram that one.You have a husband? I never suspected.
Like this? Not wifi, but in theory would work.
https://www.amazon.com/Digital-Shak...ocphy=9016148&hvtargid=pla-592690303097&psc=1
An iphone (alarm feature) rigged to a stereo amp and the dial turned to 11 could also work.
Build the bed from Wallace and Grommit.
This is the 21st century, got to get with the program.Your husband and daughter have a son. How remarkably modern.