The wonderful minhag of learning all night Shavuos does not diminish the obligation to daven Shacharis. And davening without being able to concentrate and be emotionally involved is close to useless. Tefila has an inherent challenge built into it. It must be done with complete involvement, yet it is done routinely, and routine tends to render the actions more mechanical than emotional. That exists every day. But when we take the beautiful tefilos of Yom Tov and try to do them while sleep deprived, with our heads bobbing up and down, dozing on and off, and unable to concentrate, we have a serious problem. It may well be better to sleep first, and daven later (with fulfilling requirements about zman krias shema and tefiloh. I have heard of those who go to mikva before shacharis, and are thrilled to find a mikva that is cold. That should wake you up enough to get through Mussaf without dozing.
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