system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that sitting for extended periods can cause blood clots but laying down sleeping for 6-8 hours a night doesn’t?
gpt
When you sleep your blood does not have to flow upwards, your body is mostly straight and you are still moving alot in sleep. So If your leg is broken and you can't move a little your chance developing cloths is higher. That's why they give you shots in hospital every day. While sitting the legs aren't moved much, they are angled and the blood have to flow upwards.