First, check the essentials: Are you sleeping, eating decent food, and exercising regularly? If not, you may be neither burnt out nor lazy. Take care of this stuff first. Second, have you spent the last year working so hard that nothing short of a physical illness will make you slow down? Do you regularly push through problems with sheer willpower? Do you crave the next "green" unit test result beyond all sanity? If…
In fact if you're putting that many hours, you're probably also mistreating your body, doing little to no exercise and incurring in sleep debt. And I repeat, I know because I'm being this stupid. After two months of this ridiculous schedule I find myself fairly drowsy during the day, unable to resolve challenging problems. My body is acquiring fat very easily and I suffer from the stomach + a lot of headaches. And I just have been two months through this.
To be honest, the period in my life in which I succeeded the most was the one in which I had my needs completely met and I enjoyed every bit of my work, working as hard as I could. If you're a coder mental clarity is one of your biggest assets, so either run out of that health destructive spiral (that's what I'm going to do as soon as this quarter ends) or just stick with physical and mental problems.