I recently learned a lesson the hard way and maybe you can relate.
Over Christmas, I was working on a project with a specific deadline. I underestimated the amount of time I needed to complete it and so I was behind right off the bat.
No worries I said to myself, you can pull all-nighters and get it done. So, I went to work and fully immersed myself in my tasks. I became tunnel-visioned and could think of nothing else but my project.