I used to keep my phone under my pillow(no night table) with an alarm on it.
“Stressed” is not lightly used when I talk about how it felt for my phone to go off and not stop. Alarm off, power off, under a pillow, thrown away, even smashed and snapped in two it would always keep ringing because, of course, in the real world it was under my head and never changing. Once I woke up proper and turned it off the silence was painful and I felt so unrested I very nearly cried.
It’s not an “emotional” nightmare, i.e. it didn’t pull at anything heavy on my mind or anything, but it was torturous as a “physical” one.