I don't have a thermometer so not sure but I have them on top of my HIFI amp which is on all the time and is quite warm. They're in some damp kitchen roll in a sealed bag. Same thing I did with my Cayenne chillies but they're a lot easier to germinate.
Can it stop them germinating if its too warm? I doubt its anything to do with the seeds as I also have some Bell Peppers in a separate bag that are refusing to germinate.
Ideal temps would be ~27 degC for the naga. Although some peppers take longer to germinate, so keep at it.
Initially the seed will rehydrate and absorb water. It can take a while for this to happen. Some growers soak their seeds in water overnight before attempting to germinate them.
Is the kitchen roll still damp?