Amphetamine is an app that allows one to keep their device running, awake, unlocked, etc.
I use Amphetamine all the time, especially with agentic coding, and it’s been an essential app for me for years for other reasons (live data processing, presentations, etc.).
‘caffeinate -i ‘ No apps required
Ok but it's much nicer having an icon I can quickly click which also visually shows me if it's keeping the computer awake. It's very easy to choose different amounts of time to stay awake, including giving it a specific end time rather than a duration. And the little audible alert when the time expires is nice for letting me know it's over so I can decide if I want to add more time. Plus it has an option to prevent accidentally draining the battery to nothing by letting the system sleep if it drops below 10% battery.