system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it bad for someone who has a concussion to fall asleep?
gpt
A possible complication of a concussion is a brain bleed.  They keep you overnight at the hospital to make sure that this doesn't happen.  It's not exactly bad for you to sleep on a concussion, but it is bad to sleep if your brain is bleeding.  Because you might not wake up.