No, overworking only comes if you're not motivated with what you're doing, forcing your brain to overwork. But if your brain is simply tired of doing motivatin

No, overworking only comes if you're not motivated with what you're doing, forcing your brain to overwork. But if your brain is simply tired of doing motivating job, then it just reduces a level of motivation, until it gets enough rest. So it's a self-regulated system.