Rhonda Patrick· PhD
Um, a lot of people also call it deep sleep. It's not called deep because it's the good one or the most restful one even. It's called deep because your arousal threshold is the highest and it is hardest to wake you up from that sleep stage because the the thinking parts of your brain are largely like detached and offline. You're not you're not thinking during that time. Your muscles are very relaxed. This is for athletes. This is super important because this is when growth hormone is secreted in N3 sleep at stage three or non-REM stage three sleep.