Answer the question about text:

After a wonderfully long vacation in Florida ( see previous posts for a few brief highlights ) with Mom and Dad Gregg we fly out of Orlando on September 2 , 2008 . The flight with Aer Lingus leaves Orlando International at 6:00pm and arrives in Dublin at 7:00am on September 3 . After an hour or so layover we will arrive at Heathrow International at 10:15am . At Heathrow we will catch the Oxford Bus to Oxford .

Why is the narrator feeling so tired and exhausted ?
The narrator experienced a lot of layovers .