it is often the case that shock numbs us for a while after something happens suddenly. and you didn't suffer physical pain, just a fright and confusion... the sleep is probably the mind's why of buying time to deal with the shock and confusion...

all in all, i would say, let feelings return as the will, don't fret over the delay, sleep as much as you need, and delay quarrelling with bf...

i wish you well~
Gus