Sentence 1: Dan intended to work hard on his favorite HIT. 
 Sentence 3: Dan hoped there'd be more tasks at some later point 
 Sentence 4:  For now though he'd be lucky to make it to his bed 
 Sentence 5:  Dan submitted his last one and turned off his computer 
 Given Sentence 2: But he suddenly grew so tired he couldn't keep his eyes open.