Not sure if this has been posted before, but I remember seeing someone post here a few days ago about D3 making their sleep worse. This lady says that there is a narrow range (60-80) for 25OH where sleep is normalized and anything outside of that range disturbs sleep, high or low. I think she's correct. I've always fought with insomnia, but never as bad as the last 2 years. And, that's pretty much the same time period where my sleep went from ok to horrible.