I used to love my coffee but now it makes me a shaky mess. I had really good luck with most of those little bottles of " 5 hour energy." they seem somehow to be buffered. I still like them but in some situations I find that they last too long. I have the typical sleep problems and often cannot get more than 3-4 hours at a time. So I found a product called "Livewire Energy Chews." if you google them on line you can buy bags of them in various flavors pretty cheap. They work really well for me and the effect fades after about two hours so I can control how long I am alert.