Answer:
Insomnia
Explanation:
Insomnia is a disorder which can affect anyone, and this is usually is seen in people who experience symptoms such as: Difficulty falling asleep at night, not feeling well rested, irritability/depression or anxiety, increased errors made.
These are all symptoms that are clearly experienced by Lee, and being irritated all the time may be one reason his marriage was affected. His job is at risk because it is likely he is making a lot of mistakes at work due to the lack of sleep.