Thanks. I don't do caffeine on a regular basis. However I never felt like this even if I did. But I take tea at least twice a day, maybe that's the culprit. 
 

Coinsreporter

Just because you're used to it doesn't mean it doesn't effect you 

At some point in time it has 0 effect on you, I can drink espresso before bed and just fall asleep. Maybe having kids helps:) 

Catcher

I've done no caffeine most my life, anytime I drink some it ruins my sleep for days, idk how people have it every day