How to rest?

As an AuDHD perfectionist I’ve never valued rest that much. I feel like I should be doing something interesting and being sedentary is bad for you. Recently I have realized the importance of resting as I have been exhausted by external demands and stimuli. I am at the point where even mostly lying around in my room all day, small demands and noises are too much. All I am able to really do is hyperfocus on my phone or maybe half attentively read. I know people can spend days in bed recovering from life, but I don’t have that time. I value this time not doing anything, but I’m afraid if I don’t get active or something I will have trouble falling asleep later. I know staying in your bed while awake disassociates it from getting ready to sleep so I have been lying elsewhere. Any tips? I have been eating. Are there comfy headphones that actually kill all the sound? Bc my ears do not want to process anything anymore.