answer:I need less sleep now, but the biggest drastic change in my sleep happened when my thyroid went whackado about ten years ago. My sleep is still influenced by my thyroid a lot, but I don’t believ it is the entire reason for sleep changes. When I was younger (childhood through my early thirties) 9 hours was my magic number. If I only got 6 one night, I could easily take a 3 hour nap to make up for it. If left to my own devices I easily would sleep the straight 9 hours. School and work disrupted that for me, because I tend to be more of a night owl. Now, it isn’t unusual for me to only sleep 6 hours a night and then somewhere during the week I take a nap or two that makes up for some sleep deficit. I don’t feel the 6 is enough or truly restorative and it is frustrating. Partly thyroid like I said, and also some stress added in, and probably some other hormones.