I always take my hearing aid off when I goes to bed. I had a flashing light alarm clocks in the old days and they work for me a lot. I had never had a vibrating bed that would wake me up from the dead. As for my only son, I could not afford a flashing or vibrating baby cryer so I put my son facing down in his little baby carrier next to my bed and just put my hand on his back to feel his crying if he cried. I never had a problem with it. I never used my hearing aid to hear his cry, because like glasses you just don't wear the hearing aid. Beside it is not comfortable to wear the hearing aid to bed on.
I remember when I was in the hospital for the stomach surgery, I was told by the surgeon that I should leave my hearing aid on but take my glasses off. I was puzzled at him and when I was out into darkness and not hearing any sounds. When I woked up from the surgery in the hospital room, I was a little bit groggy and I felt my hearing aid on and I did not like having the hearing aid on like that. This was the first time I have ever wore a hearing aid on in the hospital. I don't know where that surgeon get the idea for me to leave my hearing aid on.
