Stray Dogs Keep Barking All Night Long

I don't understand dogs' barking All night long! They keep barking for reasons that We clearly don't understand them... There might be someone or Even something that bother them... We really ignore dogs' loud barking Especially all night long... They stay up all night long barking, but They stop all day long Simply because they go to bed... We don't know if They see ghosts or anything else! Long nights scare dogs in What they really contain... We get worried about those stray dogs' Long and loud barking, but Up to this moment We never get any reply ever! Only stray dogs keep barking For their own reasons which we really ignore... ______________________________________________________________________