Introduction: Shacharit: When To Begin

B'di'avad, you can say shema and amida as early as 72 minutes before sunrise (alot ha'shachar).  You can put on tefilin and tzitzit/talit even earlier, although you may not say the blessings over them until “mi'sheyakir”—which is later than you can say shema and amida!  (See above.)
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I just read this halacha, Introduction: Shacharit: When To Begin , at www.practicalhalacha.com. I think you will find it very interesting.