I've done a few 30 minute sessions in an anechoic chamber, which is completely devoid of sound, and it's not as pleasant as it sounds. You hear a lot more that

I've done a few 30 minute sessions in an anechoic chamber, which is completely devoid of sound, and it's not as pleasant as it sounds. You hear a lot more that's going on in your head/body, and regret not wearing earplugs to those gigs you went to years ago.