I got one of those cheap waveshare 60GHz modules with heart rate detection a few years ago. My goal was to build a sleep tracker - stick it under the bed pointing up, detect getting in and out of bed and falling asleep.

Unfortunately even just pointed straight at me with no obstructions and nobody else in the room the data was more or less random noise...

I wonder if now (after few more years of development, more reputable manufacturer and more money) it is worth trying again?

Unfortunately even just pointed straight at me with no obstructions and nobody else in the room the data was more or less random noise...

What steps did you take to limit the detection bandwidth? SNR is often a bandwidth problem, not a sensitivity problem.