Yes: Black tea is an excitant and may keep you up if you are not used to drinking it often. It is also a diuretic and makes you go to the bathroom often, another reason to keep you up!
Answered 2/13/2013
5.3k views
Per Medline: > 5 cups of black tea/ day, can cause problems with sleep. http://www.nlm.nih.gov/medlineplus/druginfo/natural/997.html.
Answered 1/3/2014
4.6k views
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