Prince William's newborn son may be sleeping "reasonably well," but it doesn't seem like the newly-minted dad-of-three is having the same luck.

Two days after welcoming his third child with wife Kate Middleton, the Duke of Cambridge attended the Anzac Day Service of Commemoration and Thanksgiving at Westminster Abbey with his brother Prince Harry and future sister-in-law Meghan Markle.

While he was all smiles chatting with Markle and the crowd before making his way into the church, during the service his energy levels severely dipped to the point where Prince William was caught struggling to keep his eyes open. In fact, he appeared to actually fall asleep for a few seconds before he jerked himself awake.

What would his grandmother Queen Elizabeth say!? She may slightly scold him, but let's be real: He is the father of a newborn, two-year-old Princess Charlotte and four-year-old Prince George. Sleep is probably very hard to come by these days.

Despite his lack of shut-eye, all is well at the Cambridge household. He told the crowds today that his new son is doing "very well" and that everyone is "in good form, luckily."

Let's hope he gets some good sleep tonight, though.