Context: It 's a tiring day . I slept really late ( or early ) this morning and I could barely think right before I speak . I ' m always having this half a second lag when I talk .
Question: What may be the reason for this situation ?
Option 0: They had done a lot of walking around that day .
Option 1: They had stayed up late the night before .
Option 2: They needed to drink coffee in the morning .
Option 3: They had school all day .
Answer: 1