Does the black tea disturb your sleep?

In my case it depends upon the number of tea cups which I drink in a day. I normally drink 5 cups of black Indian tea. I am drinking this number of tea cups for more than 25 years. (Since my childhood) My day is normal. If i drink 7 cups of black tea, (I mean two cups more than my normal routine it will shift my sleep ~ 3 hours later. ) I am more active in the night. If I normally sleep 12'O Clock at night, my sleep will come 3'O clock at night. And the sleep will be not so comfortable. Similarly if I drink less tea than my normal routine then I have again the same problem. If I drink 3 cups of black tea I again the same problem. I can not sleep at night. I feel very tired, unhappy, very uncomfortable & stresic. When I am not sleeping and i have drunk less tea in the day than my normal routine, I get up from the bed, make a tea and drink and again go to the bed, I shall sleep within 5 minutes. Because it will relax my body make me happy. Less tea disturb me more than access tea. It looks like certain amount of caffeine in my blood stream must be present to keep me happy and comfortable. Access amount of tea disturb my sleep. But less amount disturb my whole body. If I drink no tea in the day, I have headache. I am unhappy, uncomfortable and very sad. I have pain in my whole body. I can not work easily. Green tea or fruit tea do not help. The green tea or any kind of fruit tea has no effect on my body.