Is something in your life causing stress?
I've been sleeping really well lately, which is odd. I think it's because I finally got a job that I really want. I hated the place I worked before so much that it caused never ending anxiety. Plus I knew being there was just hurting my resume. My knew job is busy and stressful, but I like it.
Also, I've been taking valerian root on non-lifting nights and melatonin/zma on lifting nights. Seems to help.