A software developer, Liam, was initially energized by a challenging project with a tight deadline, working extra hours and producing high-quality code. As the deadline neared, the pressure intensified. Liam began experiencing persistent fatigue, found it difficult to concentrate, and started making simple errors in his work. Despite spending more time at his desk, his overall productivity and the quality of his code declined. Based on this scenario, identify the specific state Liam is experiencing and explain your reasoning using evidence from the text.