My 3.5 year old has always been a great sleeper. Sleeping about 12 hours a night no Wakings no real issues. Lately he's been wired at bedtime and is having a hard time falling asleep but he is exhausted. He's sleeping through ok but is then waking early around 630 ish when he usually sleeps until 730-8. I've tried an earlier bedtime with no luck. Just wondering if it's just a phase ? He's clearly tired during the day and he gets that wild wound up thing especially around 4 pm. Any tips