It is not expresso. Neither is an energy drink. But a milk tea like this is sure to keep you awake the whole night if you take it at midnight. I had many mistakes of drinking teh tarik or pulled milk tea around 10 pm and had problems falling asleep right up to 4 am.
The other day, I drank one at 11 pm and stayed awake till 6 am. Now, I wonder what they had put into the drink that makes one so awake?