I think none of us enjoys being institutionalized as we are in schools or jobs or, whatever else, so it stays with us in the subconscious. For years I had nightmares about the poor quality of the bathrooms at my elementary school
I think it means that you were reluctant to leave your dreams behind and would want to delve in them a bit more. Whoever invented the alarm (clock) should be shot, it brings misery to everyone everywhere.