Honestly, I don't think anyone is the asshole here. It's just a shitty situation (with you feeling unwell plus not being able to sleep) at a time no one's at their best. It sucks to be sick with covid and it sucks to be woken up when you have to work.

I understand him being annoyed with the light, though he could have handled it differently. He didn't need to hound you about it. For example, he could have agreed for you to go to the couch if that's what he would have preferred (I'm just guessing, though maybe he didn't want that—what the hell do I know?). I'm wondering if he felt bad at the idea of you going to the couch when you're sick, but he could have helped you get comfy there with some pillows or something idk. Basically, communication was missing.

Could it be that being cooped up together is making things tense? I know that always affects me negatively after awhile.

Anyway, the main reason I wanted to reply—if you can get access to an ereader with a backlight, I recommend it! Alternatively, you could read on the free kindle app on your phone (I like it because it has dark mode with a black background). Just make sure it's something that can dim and it shouldn't make enough light to bother him.

I hope you feel better soon! I'm sorry you had to deal with this when you were already feeling unwell!