Heat is an issue to the entire interior but sun light on the screen..rrrrrrrrright..I'm gonna start making seatbelt covers and claim that the seatbelts will become damaged without the covers I invent.
If you're concerned -
A) Ceramic tint your windows including your windshield. I have this on mine an it is freakin great at reducing interior heat. The windshield has the lowest darkness tint (I think it's 50%) and you can't tell it is tinted at night, you see everything with no issues what so ever.
B) Get a windshield sunshade.