It could be, I suppose... without seeing your little egg clusters, I couldn't be sure, though.
As far as I know, breeding and spawning of cories can take several days. They do the glass dance, which you might have seen, 2 of them try to mimic each others movements, and this can go on for for a good few days.
If they are quite active at night then that might also explain their resting in the morning. Couldn't be sure, though!