"Take sleeping as serious as other ventures in your life, it's not just the interlude between doing things"

I think this is an understatement...I feel like your sleep is more serious than other ventures in your life, because more often than not success in those other things depends on getting enough sleep. Tired bodies and brains don't function properly. There's a reason terrorist organizations (and the CIA in Homeland) use sleep deprivation to torture people and wear them down, to force them into giving in/giving up. Sleep deprivation can and will drive you crazy: it disrupts your mood regulation, ruins your emotional wherewithal/resilience, undermines your sense of identity, and eventually induces psychosis. Sure, this is at the extreme, but you'd be surprised by how many Americans are chronically sleep deprived, including endurance athletes, and how many underperform because of it. Along with nutrition and exercise, your sleep is a cornerstone of your physical health and your mental health, which are on the same continuum anyways.

I've been crushing my sleep game for a couple months after essentially not sleeping for two years, and I'm in the best shape of my life despite training fewer hours and at lower intensity. To add some do's and do not's to what other people have said and to contradict some advice you've received above...

1) Sleep in a completely dark room. Blackout shades to extinguish any light coming in from the windows. Electrical tape over any ambient light sensors on clocks, cable boxes, speakers, etc. Door skirt and closed door. Make sure it's completely blacked out in your room.
2) Make sure it's cool but not cold. The ideal temperature for sleep is between 70 to 73 degrees. This will probably feel cool, especially in the summer, but it's worth the electric bill to get higher quality sleep.
3) As much as possible, make sure it's completely quiet. No ticking clocks. Get rid of the window'd air conditioners (I realize this can be a problem vis a vis #2...install central air then). Kick out the pets, even
4) DO NOT take hypnotics (the 'z drugs'...ambien, lunesta, etc.) or benzodiazepines (xanax, ativan, valium, klonopin, etc.). Not once, not occasionally, not ever. Any doctor prescribing this shit for anything but an acute panic attack ought to lose his/her medical license. For every person who claims to take these poison pills 'a few times a month', there are a dozen who have become chronically addicted and developed a hideous tolerance to what is only a temporary antidote sustainable only by increasing the dosage. lt's a vicious cycle, a horrible way to treat yourself, and it only ends in fail. Get started down this path and your problems with sleep and in every area of your life can and will become much, much worse.
5) Figure out if early morning awakening is correlated with some other trend in your physical or mental health...overtraining, depression, interpersonal strife, career-related stress/anxiety etc.

Also, consider using a sleep monitor/activity tracker or your 920XT to help you quantify and understand the impacts of your sleep quality/quantity (or lack thereof). I've added sleep data to my training log as a key metric to help me properly apply/understand training stimuli. When I underperform in my training, more often than not it's because my 7-day moving average for sleep has dropped below 7 or 7.5 hours. When that happens, I reduce exercise and put more effort into sleep (this is something I, and many others, legitimately have to work at!). /rant over

This always happens to me when I'm overdoing it. Melatonin helps a lot but the general sign for me is to back it off for some serious rest (may not just be the training, but the training in addition to everything).

With myself or someone else?

There's too much training/stress and not enough recovery.. what is your training look like and are you getting 1000000 calories and 50 gallons of water per day????? More is not necessarily more

I have to agree about getting checked for sleep apnea. while it maybe a small percentage of the population, those who do suffer, suffer a lot!

I had no idea until I got tested after GF told me I snore like a pig, and turned out I choke for air about 39x an hour !!! CPAP fixed it and I cant imagine sleeping with out it. it might not be you, but worth checking it out