Beginning to Lose My Mind

Earlier this week, I started to get up and get ready for work. My morning routine is that I tell myself what time that I need to be out of the house. And it usually works. Well, that morning, I told myself I needed to be out of the house by a certain time ... then I thought about it ... and realized I was wrong. Because if I left the house at the time that I told myself to ... I would've been half an hour early to work. This morning, I did the complete opposite. And I haven't figured out why yet. I tried to figure it out, tried to reason it out, yet couldn't wrap my mind around it. It still doesn't make any sense to me.