So in my own experience light does seem to be a factor somehow
Out of curiosity, what are you doing with the light off? Just sitting in the dark?
But there's a lot of street light as I live in a big city, so I can do with that (it's fine as long as it's brighter outside). I also have some xiaomi battery-powered motion-activated night lights to move around. My screens and TV are adjusted to low brightness and dark mode through automation. It works out ok for me.
I can basically do my normal activities with some exceptions. For example my Oculus quest tracking doesn't work. But I don't want to wear that in the summer heat anyway.
I don't think it's heat as I only have LED lights. Also, mosquitoes are far from the only troublesome bugs here. But keeping the lights off really seems to help for them too.