I found this article helpful for understanding decoherence, as the diffusion of quantum entangelement from the complex inter-relations of particles. Thus why my body cannot be in superposition, as it would decohere at the scale of a microbe, nonetheless at the scale of an organ or whole body.

https://getpocket.com/explore/item/real-life-schrdinger-s-cats-probe-the-boundary-of-the-quantum-world