Reddit mentions of Progressive Sight Reading Exercises for Piano   [PROGRESSIVE SIGHT READING EXER] [Paperback]

If losing weight required nothing but eating ice cream, nobody would be fat. If being a doctor required nothing but playing your favorite video games all day, we'd have more doctors. If getting a well paying job only required sitting on your couch, everyone would have great jobs and nobody would be unemployed.

People who are good at things worked to get good at them. That work usually involved things that aren't inherently fun. It's fun to be good at something, but you've got to pay your dues and put in the work up front to reap those rewards.

I don't see why people find children's songs so demoralizing and demotivational. Is it ego? Does it hurt how "cool" a person feels playing an instrument if they are playing something inherently uncool? Is it just something cultural about wanting to separate yourself from "baby" things?

In short, you just have to get over it, suck it up, and do it. If you don't like the songs, maybe just find joy in the process or the progress (which will be very slow and incremental). Realize that long-term goals usually require short-term discomfort.

Anyway, for beginning sightreaders (and even advanced players who find they suck at sightreading), I recommend this book. It's still not fun, but the exercises are about as easy as they come and there's tons of them (over 500). Also, they are better than children's songs because they are relatively random and not memorable so you're not cheating your rhythm reading by knowing how they go ahead of time.

Great info here. Consider playing from a dedicated sight reading manual, like this one: https://www.amazon.com/Progressive-Reading-Exercises-PROGRESSIVE-Paperback/dp/B008MCSZZU