Scarred,
I'm glad the possibility of falling asleep in the tub scares you!
Honestly, I don't know of any such device. I didn't know if your hubby was the creative, inventive type? I know there are a lot of other devices to help us, but this one I've not seen. Maybe try googling and see if you find anything? Although I'd definitely only buy somthing form a reputable company!
Another thought - how about
calling a medical supply store near you? Maybe they have something. (course they'd probably just tell you to go to bed!
)
I used to fall asleep on the couch decades ago. If I did that now I'd never be able to move my neck, or the rest of me for that matter! Oh, the woes we deal with!
PaLady