Club mate is the drink of choice in the start up community in Berlin. I've made the mistake of drinking that in the evening a couple of times and regretted that at 4am by being wide awake and unproductive the next day. If you are not familiar, mate tea which this is based on contains a form of caffeine that is particularly potent. It's like drinking multiple espresso shots. Don't drink this if you have blood pressure issues.
In general, I've learned to moderate my caffeine intake and restrict myself to mornings only. The more you consume, the more you need of it to work at all, and the more likely you are to have side effects like feeling tired, having poor sleep rythm, headaches, etc.
When used in moderation it's a great tool for getting yourself productive after a lazy weekend on a monday morning. However, if you feel tired all the time, stop drinking coffee and get a few nights of good sleep in.
In general, I've learned to moderate my caffeine intake and restrict myself to mornings only. The more you consume, the more you need of it to work at all, and the more likely you are to have side effects like feeling tired, having poor sleep rythm, headaches, etc.
When used in moderation it's a great tool for getting yourself productive after a lazy weekend on a monday morning. However, if you feel tired all the time, stop drinking coffee and get a few nights of good sleep in.