Caffeine content in energy drinks is very high. Unless you are already tolerant to the high doses or unless you are dependent on caffeine, it may be difficult to tolerate it. You will find yourself having palpitations, nervousness, jitteriness, anxiety, sweating, inability to concentrate, poor sleep if you have it in the afternoon or evening, headaches, muscle twitches and sometimes gastric disturbances (acidity as well as increased bowel movements). Caffeine is also a diuretic and will cause increased urine output and secondarily cause increased thirst especially in summers. Coffee when made at home has much less caffeine content and may not give rise to symptoms. You might want to consider restricting your coffee intake to 2 or 3 per day (of medium strong, medium sized cups) to avoid such symptoms. Such symptoms may be more on days when you are already anxious or stressed with something. Hope this helps.