Are you getting any exercise these days or just concentrating on the job/errands/etc? If not, get some! Don't do any right before bed but early evening, or sometime during the day, or at least lengthen your dog walks and stretch out at night, just do something. This can loosen the tight muscles of your mind as well as your body and set the stage for sleep.

Ditch caffeine after noon for a while til you see if it helps. Cocoa and mountain dew count too!

Lay out clothes and stuff early in the evening so it's all done for the next day, get all gnats out of your head and onto to-do-lists or whatever. So you can tell yourself, that's it, in the morning I'll be ready to go, nothing to worry about or remind myself about now.

Take a warm bath.

Get the room & bed the right temp for you, whether you like sleeping cool or warm, whatever.

Read something tedious.

Relax, get settled in bed. Now start some simple breathing exercises, like they do in yoga, just breathe deeply, concentrate on the in, out, fill the lungs completely, empty completely, count if you like, yada yada. I generally don't make it past the count of six.