Dreams about being on a School bus?

i keep having a dream that its the end of the day at school and im trying to find my school bus before it leaves the lot,sometimes i miss it and am stuck at school till dark (very scary while i dream it) othertimes i get on the bus with familiar people on my way home like last night. i have had this dream more than 10 times, different schools, people but always same sequence wth does it mean