I think there's quite a bit of variety in people's alertness in reclined / supine postures. Personally I have trouble sleeping unless conditions are really goo

I think there's quite a bit of variety in people's alertness in reclined / supine postures. Personally I have trouble sleeping unless conditions are really good for it. This sucks, but I think related to this trait is that it takes quite a while for me to feel sleepy as a result of supine / reclined postures.