ballistic
...if everyone in the world shut their eyes, everything would cease to exist.
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No, this thinking is wrong. (It would be ok. if you are dying - but not if sleeping, or closing your eyes..)
Note: there is always a type of "sensorium" which is existing subordinated to yours:
cells, molecular structures, and finally atomar and subatomar structures. Therefore, the things continue to exist in reality - until there would be a situation where ABSOLUTELY NO sensorium does exist to observe, sense or measure any TIME and/btw any ambient physical change of state. In macro-structures, e.g. this happens in the middle of a "black hole". Ask physicists; they will assert there is NO TIME at all. Or BEFORE the BIG BANG - there was the same situation. There was NO TIME existing at all. Ask Mr. S. Hawkings; he will explain it better.