system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we sometimes have blurry vision when we wake up?

Is this something that only happens to people with glasses, or is this an occurrence for most people? 

EDIT: Sorry, if this came off as anecdotal.
gpt
Eyes have some amounts of oil and mucus on them, and when adequately moisturized by the tear ducts we see fine through it.  When tears dry up (which can happen overnight), the oil and mucus can appear somewhat blurry.