When you have been Playing/Or chating Online and you want to go to sleep But its Morning So instead of saying Good Night you say Good Night Morning Or GNM
When one wakes too early in the morning, in which it is still darkoutside.
Gabriel woke up at 4:00 A.M. Therefore he was late, because he still thought it was nighttime. This is when nightmorning can confuse someone while they are sleeping.