system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 What stops humans from sleeping for days at a time?

Bears hibernate up to 6 months, why can't we?
gpt
One reason is that you can't store as much nutritients as a bear can. Your body is not situated to do this. Bears store nutritients to hibernate in periods where they would lack food and overall the period where they wouldn't be happy to live in.

If that makes sense.