Encrypted C drive not waking up after going to sleep?

I encrypted my C:/ drive using BitLocker and noticed that when it goes to sleep, my screen stays black when I try to wake it up. My only solution is to turn off my computer and turn it back on - is that to be expected?

Follow up question I had - my computer doesnt ask for a password when I turn it on. I just have to enter my windows credentials, does that mean my drive isnt encrypted? There's a lock symbol by the drive so I assumed it was.