I read a few articles that said not getting enough sleep or getting to much sleep will cause weight gain or inhibit weight loss. Apparently, this is esp. true for women 30+. The articles said that 8-9 hrs was optimum and that those who regularly slept that amount and at the same time each night would be able to loose and maintain their weight the best. This was something I had never incorporated in my previous endeavors to loose weight.
When I lost 97 lbs, one of the most beneficial things was learning that people often develop weight problems if they do not get the right amount of sleep. I made a conscious effort to get 8-9 hrs nightly and it had a very dramatic effect. The weight came off much easier than ever before.