system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it recommended to not sleep for a while when diagnosed with a concussion.

Was diagnosed with concussion yesterday, have been several times before (sport-related). When I tell people, they often tell me to make sure I don't go to sleep for a while. Where does this come from? Is it based on any actual medical advice?
gpt
A concussion is a functional injury, which means you'll have difficulty operating at 100% for varying amounts of time. Sleep is the best way to heal said concussion.

Staying awake right after a concussion is helpful in assessing if there is also physical damage, such as swelling or bleeding in the brain. But if you have no issues walking, or holding a conversation, and neither of your pupils is dilated, rest is your best option for healing the concussion.