Hi, my little boy is 15 weeks old, has 4 or 5 naps a day (he cat naps). He goes to bed at 7pm and sleeps until anywhere between 2.30 and 3.30 for a feed. But then he wants to stay awake for up to 2hrs!!! He’s happy, smiling, cooing, trying to roll over. Do we think this is a development phase as he keeps trying to practice rolling?