Besides , perhaps the hum of the equipment and the drone of the police scanners will lull me . It would n't be the first time I 'd caught some z 's at my desk , only the first time it did n't happen during my technical " shift . " Why ca n't I sleep ?

Give answer the following question using evidence from the above passage: What may happen before i fall asleep ?
I will try to find something that will help me fall asleep .