My kid started hating waking up from his daily nap. I still don’t understand why or how, but at least half of the times, he wakes up so mad! And there seems to be nothing to do. At times he gets more mad if you try to comfort him. Sometimes taking in a soothing voice helps, but not always. Often giving him his pajama pants helps -and that’s the only time in the day he requires them. I don’t know if it counts as tantrum, but i can’t classify it as anything else… we usually wait it out, can take up to 20 minutes of screeching.