Should The Lasagna Be Covered During Baking I Made A Lasagna Last Nite At 8pm And It Was Left Out All Nite Is It Still Good? I Found It At 6am Today.?

I made a lasagna last nite at 8pm and it was left out all nite is it still good? I found it at 6am today.? - should the lasagna be covered during baking

He was in a glass lasagna dish and covered.