Why is the node-sass process constantly hanging in active?

Question

Node.js

I have 4 sites spinning with a TOTAL attendance of no more than 100 people per day on a Digital Ocean droplet with 1GB of RAM. I was surprised why 87% of the memory is constantly occupied.
Using the top command, I noticed that 6 node-sass processes are constantly hanging in active.
It seemed to me that with the help of this module, css is created 1 time during the build. Why is node-sass always active?