Unpredictable schedule

First, A was very predictable. He woke at the same times at night as well as for the day. Lately, he's been waking for the day around 7. Today, M came in to say goodbye around 5:30, and asked "How many times did he wake up last night?" I said, "Oh my God, none!" I freaked out a little bit and asked M to go check on him. He returned and said, "He's still breathing, and somehow, his legs are sticking straight up." A woke a little later, ate a little bit, woke an hour after that, ate a little more, and then woke for the day around 8.

All this after he was waking around midnight, 3:30, 5:30, 7 for the past week.