My son is 20 months. He always took his daily nap from 12-3. And bedtime was 7:30. He napped well and went to sleep at night well too. The last two weeks he’s been refusing his nap. The days he doesn’t nap at all he goes to bed at 7. Which is fine. The problem is, some days by 4 or 5 pm he gets miserable. Hysterically crying. Falling asleep on the couch. Absolutely miserable. When that happens he sleeps for less than 40 mins and has the hardest time going to sleep. It’s literally a lose lose situation. I have no idea why he won’t nap. I tried everything. Regardless he gets miserable by 5ish and it’s impossible to keep him up.