8 month old hysterical and refuses to sleep?

It has recently become a huge ordeal for my 8 month old daughter to sleep at night. She was sleeping up to 9 hours through the night, and suddenly she is fighting it with everything she's got. She's very easy to put down for a nap during the day, but she will randomly wake up hysterically screaming and crying at night. Sometimes even 20/30 minutes after falling asleep. I work very long hours throughout the week and I am entirely drained not being able to get adequate sleep. Is this common for a baby her age? She is our first born, and we are starting to become concerned