The light on the end of a Dell laptop power adaptor is like that. I tried multiple layers of electrical tape, colouring it in with a sharpie and even painting over it and nope, that bastard light cannot be dimmed.

My main complaint is when using the laptop in dark bed to read ebooks and it is utterly blinding. I end up folding a bit of duvet over the bloody thing.

A small piece of tin foil under the tape should help with that.

i drop a towel over my laptop if i need to leave it charging overnight

That sounds.. not great, for li-ion batteries. Like you want to stress test the safety circuits which avoid thermal runaway.

I bought a USB charger to plug into my cars cigarette lighter plug. It lit up the whole cabin with blue light at night. This blue cancer has existed since blue LEDs were invented and immediately became a chinesium electronics favourite. Very tiresome.