Her Indiscernible Cries

My latest wish list:

1) I want to have undisturbed sleep every night.

2) I want to have undisturbed sleep every night.

3) I want to have undisturbed sleep every night.

REcently, why does Bernice suddenly cry long and loud for no discernible reason when she is sleeping? And late at night when everyone is already asleep. It is not that she wants milk, not that her diapers are wet, not that either she is feeling too hot or cold. And basically there is nothing that i do including cuddling her, offering her the favourite pacifier can stop her from howling inconsolably.
Maybe it is the luck of draw that i have a baby who fusses and frets easily or could it be that there is really something that she needs? I only hope that she will outgrow of this soon so that i can restore my restful nights again.