Weird falling asleep happens to me too. The $5 acupressure mat is so deeply relaxing. And also helps me heal faster from bouts of lower back prolapse. Would definitely recommend, best $5 ever spent.
It takes some conditioning, you most likely won't last 5+ minutes the first time.
Norway - Biltema. And pretty sure they are dirt cheap in Poland too. They actually differ in how sharp they are, so maybe a slightly more expensive one will be marginally better.
Forgot to add: BUY THE PILLOW TOO. The whole set is worth it.
It takes some conditioning, you most likely won't last 5+ minutes the first time.