Are you missing out on skin changes if you don't keep a record of your skincare routine?

Have you ever wondered, "What's different from yesterday?" while taking care of your skin? Lately, I've been feeling the need for a skin care journal. Even though I use the same products, my skin feels stable some days, and sensitive others. I think it would be easier to identify the cause if I had a skin care journal. Would it be helpful to simply record when I use cosmetics, my skin condition, and my sleep? I'm also curious if anyone has used a skin care journal to identify the cause of their skin troubles or find a routine that suits them. If you have a simple skin care journal method that's easy to get started with, please share it with me.