When you share a spreadsheet in Google Sheets, you’ll want to see the changes others make. You could check the version history, but to stay on top of things in real-time, getting notifications about each change is much more efficient.
In Windows 11, sleeping and turning off your screen are two different (but related) things. If you put your PC to sleep, it goes into a low-power mode that temporarily shuts off certain parts of the hardware to save power.