Can't Sleep

So for the past couple days I have had a really rough time falling asleep. It's been taking me like 20 min - 2 hours to drift off and I'm not sure what's happening. I haven't changed anything in my routine, I've been going to bed about the same time, and I drink decaf coffee. Does anybody have any tips to sleep better? This really sucks, I usually sleep very well. Anything helps! Also tonight I had some warm milk and honey and still nothing...