Read the following context and choose the best option to answer the question.
Context: [ Blue Pill = sleeping pill , Unisom , or maybe it 's the Target brand of Unisom . ] 8/14/08 7:27 pm Well , I think I caught up on sleep last night . Steve thinks the iced tea I ' ve been drinking on the way home may be disrupting my sleep . He usually brings me iced water , but lately I ' ve requested iced tea .
Question: What may be the reason the tea disrupts sleep ?
Options: 
- It has alot of milk in it which causes an allergic reaction .
 - It has too much coffee in the drink and not enough tea .
 - It has a built in speaker that wakes people up at night .
 - It has too much caffeine in it causing sleepless nights .


It has too much caffeine in it causing sleepless nights .