After waiting for carlos for two hours, dave begins to wonder whether carlos has the night sickness that patricia described. why was carlos actually late to meet dave?

Carlos was late because of the flat tire and his cell phone had run out of batteries.

Explanation:

In the story "Nighttime in Texas", Dave had gone to San Antonio to spend a few days with his friend Carlos. Taking a taxi from the airport, he reached the place "with gardenias outside and the silver scooter parked in the driveway". But no one seems to be home. So, he waited for some time.

But when an hour had passed and Carlos did not turn up to open the door, Dave became worried. He then saw Patricia, the girlfriend of Carlos. She began telling him about the strange occurrence in the community where people with a severe cases of sleepwalking do weird things at night. In the end, Carlos finally arrived in his car, explaining that he had a "flat tire on my way to the 7/11, and I had to hitch a ride to the nearest gas station." He also revealed his cell phone died which left him unable to contact him.  

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explanation: