How bad is it really if I don't get 7 hours of sleep?

I used to sleep less than 5 hours a night for years. At first, it didn't seem to be an issue, but then I started feeling constantly tired and moody. After some research, I decided to change my routine, aiming for 7 hours minimum. It wasn't easy, but it made a huge difference in my energy levels and my mood improved a lot. So yeah, I'd say it's definitely worth paying attention to.