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For the first time in weeks, I had a good night’s sleep last night. My Jawbone Up reported five glorious hours of deep sleep (plus two hours of light sleep); I haven’t felt this refreshed in weeks.
A sight for tired eyes.
For some reason, I’ve had a really hard time falling asleep and staying asleep lately. I don’t drink caffeine after noon, I shut down electronics hours before bedtime, I don’t work out close to bedtime (90% of the time), and I’m not particularly anxious or excited about anything.
I’ve never had a problem sleeping. I’ve fallen asleep quickly and stayed asleep (minus a couple of trips to the bathroom) for as long as I can remember, so this sleep problem comes completely out of left field.
This week, I’ve been reading before bed (books, magazines, whatever) and taking melatonin, which has helped a lot. I think a nightly routine that includes reading in some capacity (preferably sans an electronic screen) may be the trick to turning off my brain for nightly slumber.
Single-tracked Mind 
That has been happening to me for the last few months, not being able to sleep through the night. I don’t know if it’s mental stress or endorphins (still in my body from my morning run?). I’ve always loved to sleep and had no trouble falling/staying asleep.
I’ve had similar issues in the recent past. I think that the ‘no coffee after noon’ rule is a really good one and I think that it has helped some. I’ve started waking up super early (on top of not being able to fall asleep right away). I agree that mental fatigue/stress plays a huge role. Sounds like you have made some changes and I hope that they start to work for you soon! I’ve also found that there is a difference when I am physically active during the day and when I am not.