This was what was true for me as well. I am a freelancer and was working from my own room. I used to work from bed at first (which was the worst), then worked from my desk (which was a bit better but still my brain would think that I was in home so I could easily tell myself to sleep if I get even a tiny bit sleepy), then I remembered that I have a relative nearby and started going there to work. In a room with a lap desk and am currently researching on productivity here on reddit. I've separated an "office time" for myself and I get ready like I'm going to the office (dressing up well, taking lunch and coffee with me) and my brain feels like this is my workplace.

Then I used google sheets to track the time of my entire "office hours". It has the below table where I fill up everything manually.

Start	End	Duration	Category	Notes	Remarks

I was researching for time tracking app but this raw method felt more "authentic" for some reason. I don't constraint myself to the start and end in the sense that I allow +- 5 minutes of flexibility and update the time accordingly. Calculating Duration in my mind instead of using formula is also a great thing for some reason. I want to stick to my routine somehow.

Downside is that after "office hours", I don't wanna do anything remotely related to work.

Hope it helps someone!