My exterior bubble cracked and leaked due to sloppy installation at the factory. When I changed it I went back with a smoked tint bubble. Read about it here.
D-I-Y Shower Skylight Bubble Change
But before that I was roasting in the summer heat and wanted to sleep a bit after sun up, so I took down the inner "garnish" and just put a piece of parchment paper over the little window in the garnish.
Cheap fix, about 10 minutes, helped a lot. And it didn't mess with the outer bubble.