Sentence 1: Mark woke up feeling very rested. 
 Sentence 3: He quickly changed into his work clothes and ran out the door 
 Sentence 4:  He drove very fast to make up for lost time 
 Sentence 5:  When he arrived, he realized it was the weekend and didn't have work! 
 Option 1: He had recently started taking melatonin. 
 Option 2: After stretching, he looked at his clock and saw he was late for work!