Answer the question about text:

I ' m too tired to finish this post . Ok , now I ' m back and I ' m post - dating . We left and I led us to a restaurant that sells an ice cream dish with Garrett 's popcorn mixed in . Wave at 644 N. Lake Shore Drive . It was superb . I ' m going to have to have that again some day .

Why did the narrator post - date their blog ?
They were really really drained .