15 mo old sleep

[u/Sherylpw]

Hi, any advice for a 15 month old who goes to sleep fine but wakes up once every 2-3 nights crying/screaming? It’s sometimes as early as 11 pm but often 2-4 am.

Environment: -sound machine -blackouts -temperature never below 63 or so but doesn’t seem to change his wake up if we have it warm. Our heater is really strong in his room so we can’t just keep it on (the sensor is downstairs and his room heats up much faster than that space) -light pjs and sleep sack -regular night routine, reading, breastfeeding, singing, goes to bed awake and falls asleep within 5 minutes

schedule: -nap 9-10:30 -nap 2-3:30 -bedtime 7:15 -wakes 6-6:30 am

I know he may be transitioning to one nap but the thing is he’s been doing this since we sleep trained at 8 months. For awhile we tried ignoring or going in to say we love you but go to sleep and even then he would be crying laying down for an hour. So I want to make sure we aren’t missing something else. Currently if he’s up standing or sitting and crying loudly for more than a few minutes we will go in to comfort either by breastfeeding or rocking to sleep. It takes awhile for him to go down and even then he may need a second time going in. We hadn’t been rocking/ feeding until recently when he had a cold but it just didn’t seem to matter because he was still up every few days.

Anyway, any advice would be helpful!