I sometimes want to know what time i started or stopped doing something on my pc so I can tell when I ate or fell asleep or something. Would be great if there's somewhere to see this. I tried event viewer but didn't get anywhere. Thanks
Not without some monitoring software. Windows doesn't save times of opening closing programs.
If you want to monitor yourself falling asleep or leaving the PC you'd probably need to monitor keyboard or mouse input as it is impossible to tell if you fell asleep reading tenforums.com or were studying it for 8 hours.
Presumably after a short time you would page up or down or look at another website rather than stare at one page for 8 hours straight. There are lots of monitoring software programs (primarily aimed at parents spying on their kids) but I've not used any so can't make a recommendation.
If you don't care what exactly you were doing but rather that you were doing anything at all then the easiest way to do what you want is probably to set your computer to go to sleep after 5 minutes or so. You can then see the sleep event (Event 42 in system log) and the wake (event ID 1). You can make a custom view in Event Viewer to show it.
This explains how to set event viewer: Logging power events to the event log - Microsoft Community
And this how to set sleep timeout: Sleep Computer in Windows 10 Performance Maintenance Tutorials
If you have a phone you could set your PC to automatically lock when you move away from it (see here: Turn On or Off Dynamic Lock in Windows 10 User Accounts Tutorials ) but depending how close you eat/sleep to your PC I don't know if that would help.
I know that you can find out when you launched a program. Not sure about any record of closing a program.
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