Turning Night into Day

For about two weeks now, Peanut has a hard time to either fall asleep at night or to stay asleep at night. Last night, she woke up at around 3:30 am and was WIDE awake. There was NO way of her going back to sleep on her own. Even rocking didn't help much - and remember, I said I will NEVER rock her to sleep, right? Well, nothing helped for a long while..... I started to get so frustrated!
After about an hour, or so, I think she fell asleep on me in the rocking chair. And I fell asleep as well. I must have woken up later, was able to put her in her bed and went to sleep on the couch upstairs, as my bed was taken by my son....
She slept until 7:30 am - that is pretty normal. She was always a good sleeper in the morning. Not like Coqui....

What is the matter with her at night? (btw, I secretly call her my nightowl!!!)

Now, on the other hand, what is the matter with Coqui??? The child that used to wake up at around 5 or 5:30 am and was ready to rule the day..... About a year and a half ago, it changed to about 6:30 am. Much better! In the last year or so, he started to sleep until about 7 am. Woohoo!
Now this morning, he slept until 10 am!!! Yes, you are reading right! I kept checking my bed if he was still alive! No, just really deep asleep! Yesterday, it was 8:30 am. I am sure for some families, this is normal, see for us, it is not! So what is wrong? Is he simply growing? Or maybe sick? Not sick enough for feeling sick during the day (as he runs around like normal!), but maybe an underlying sick that his body is fighting?
I am not sure what it is! And I haven't made up my mind about being happy that he sleeps so long now, or just worried that something might be wrong....