This is a really great idea - for work and personal life equally! Try it (for a period of time) if you have a lot going on at the moment as often if you write it down, it gives you an outlet for your feelings and thoughts...
See the below link...
https://www.the-coaching-academy.com/blog/8-things-to-include-in-a-daily-journal-by-bev-james-2885.asp?utm_campaign=59101_Coaching%20Weekly%2016th%20May%202017&utm_medium=email&utm_source=The%20Coaching%20Academy%20U.K.%20Limited&dm_i=47AU,19LP,H5KDX,4MHN,1