How does caffeine affect you, and do you try to limit your caffeine intake in the evenings?

I drink tea or coffee in the morning, at home, and coffee at work. Sometimes I don’t return calls until I have had that first cup, and it makes me feel perky and sociable.

I was drinking tea, coffee or Diet Coke in the evenings, as I wanted. Not a lot, but if I was out with friends I would have it if I felt like it. I found that I was waking up in the middle of the night and would be awake for hours. I have been limiting my caffeine intake in the evenings for the past two weeks and find I have been sleeping through the night.

How does caffeine affect you? Do you limit your intake in the evenings?