Coffee -- Does it really helps?

I've been a coffee drinker since I was 4.
Yea, it's no typo and you didn't see it wrong, Four.
My father's mom first introduced coffee to me and immediately I took a liking towards coffee over chocolate drink.
Ever since then, the number of cups of coffee I consume per day increase along with my age.
At 18, I'm taking in 6 to 8 cups of coffee per day.
However, I've reduced my coffee intake these days because my dear is watching my diet.
So, I'm only taking coffee early in the morning and late at night before I sleep.
I think it has became a routine for me to consume coffee early in the morning, as my mom was a heavy coffee drinker too but she's converted to a green tea-er.
Although coffee doesn't work in keeping me awake but it's what I have to drink to get use in the morning, and also to get me to sleep at night.
Yes, you've read it right, I can't sleep without coffee.

*The Temptation*