NoSleep still in in settings though uninstalled?
Download NoSleep.dmg or use it if already there. Mount it and click "Uninstall.command".  Reopen preferences, it should be gone. 

Uninstalling using official methods is preferred over simply deleting the app packages. Two old, but still relevant questions:


Why there is no standard way to uninstall programs in MacOS?
How do I uninstall a program completely on a Mac?