We finally got our 16 month old to (mostly) STTN a few weeks ago, using WI/WO. He's waking earlier than he used to, around 6:30 (sometimes earlier) rather than 7 AM like he used to. I've been putting him down for a nap before or at noon. He sleeps 1-2 hours, but ALWAYS wakes up cranky. He wakes up crying, throwing himself around when I pick him up. All afternoon he's cranky, only being happy temporarily when distracted from his crankiness for short periods of time.
Could he be still tired after his nap?
What can I do?