2 hours sleep
Just reported that the controller worked the night shift then came back to work the overnight with 2 hours sleep. Not blaming the controller at all-Pic has final authority. I wonder how much sleep the crew had. When people are fatigued they don't realize it and how much your affected. Like what was stated before accidents are always a chain of events. so you've got the factor of changed taxiway signage not mentioned in notams-understaffed tower-I've lost a good friend flying a double shift (weather also a factor). It's just sad to see. When the final report comes out the only positive thing is that others can learn from the mistakes and stay safe.