Sleepless Nights

At some point of time in our lives we all spent a sleepless night with wet eyes. No one had ever know it or You haven't shared with anyone regarding it. We feel that crying is like a sin so we do it silently but Crying is also a feeling which need to value it. But for every sleepless night we spend we will become stronger that let you face any difficulty but Can anyone understand the reason for the sleepless nights one is spending...!!!!