Is this a thing that your toddler went through? For the past 2 nights, DS (19 months) has woken up around 11pm/12am and been up for what I can only assume is hours. I'll go in when he cries out for me and pick up all his stuffed animals and wubbanub. He calms right down but usually fusses again as soon as I leave. He seems to be wide awake. I'll go back to sleep but he will wake me up again several more times.

He's not teething, not sick, and he naps just fine. He's been STTN and putting himself to sleep since 9 months. Once in a while he has one wake up and goes right back down. He wakes around 7:30 am, naps 2-3 hours in the afternoon, and goes to bed at 8 pm. I tried shortening his nap today but he was exhausted by bedtime from last night. Any thoughts?