I bought these green tea liquid soft gel tablets at wal-mart the other day and started taking them yesterday. They say on the bottle that they are a fat burner and lady in the check-out line I was in the other day was buying them and said she loved them. After taking them with a full glass of water as stated on the bottle and then eating a good Breakfast I felt awsome all day with tons of energy. I also took 2 with lunch as stated on the bottle. Which was at 12 noon. My problem was I couldnt sleep at all last night and was up all night. Will my body get used to the natural caffeine?