Due to a local party in my neighbourhood I was only able to sleep 4hrs . So the early get up at 4 hitted quiet hard . Leaving a bit later than scheduled and a miscalculated train departure time at my city made me just miss my train . But I still got to the Airport around 8AM .
According to the above context, answer the following question.
What may be the reason for their lack of sleep ?


The party near them had been going on all night .