Investing in the futon was the best I could do. I had issues sleeping before, back pain, fatigue etc. Since I sleep in heaven no issues at all. The Japanese know how to sleep right. For the body it is better than modern mattresses. From my experience. I will never sleep on anything else again lol.
https://www.futonbedsfromjapan.com/futon-shikibuton-mattress/
This is where I got mine. They change the designs every 6 months or so.
I wonder as well what the doggies dream about sometimes lol. But them dreaming shows that animals have a memory and feelings and a consciousness. Plus they are the most peaceful things while asleep.