If you've had too much caffeine,it can lead to significant side effects

The National Sleep Foundation offers these symptoms of excessive caffeine consumption:

-A decline in fine motor coordination.
-Inability to sleep.
-Headaches.
-Anxiety, increased nervousness and feeling dizzy.
-Feeling irritable.
-Increased heart rate.
-Excessive urination.
-Feeling down once the caffeine is out of your system .