Male 30s no medication. tired, i went to bed early and woke up around 3am to notice that my vision had a yellow tint. everything white seemed yellow tinted. after a couple of minutes it went away and never reoccurred. should i be concerned?

Usually, it is a good idea, when new medical Signs and Symptoms occur unexpectedly, to see One's PCP/GP to check it out and have an action plan should that be necessary. The Visual change could be something as remediable as Dehydration in the Hot Weather without drinking enough water before sleeping. Or it could be early sign of more complex issues, hence a PCP/GP visit indicated.