(((hugs))) and welcome to the boards!
First thing is, it sounds like he is probably a bit overtired because 14 hour days are LONG for such a young guy. I would try moving his bedtime back to 7pm, you may find he sleeps more soundly. Can you post what your routine looks like? If there's a problem with the daytime routine it will often really impact badly on night sleep.
However, if his daytime routine is good and an early bedtime isn't solving it, it may just be one of those motor milestone things you have to just wait out. Rolling back and forth, sitting, crawling, standing, walking, talking - they all mess up sleep, but (unless there are other underlying issues) it's always just a temporary thing.