In the hagadah, did the rabbanim who stayed up all night get the miztva of afikoman?
I don't know where I learned this, but I learned that the "seder" in Bnei Barak was not on Passover, nor was it a seder - They were plotting the overthrow the Romans (they were discussing "yetziat Mitzrayim" wink, wink). The morning shema bit was simply a way for the student to say, "Rabbotai, it's morning - you might be seen! Hide!"
Of course, this couldn't be written in the Talmud, which was written during Roman times, so it is written in metaphorical language.