My 20 month old has no issues going to bed at all, settles by himself around 7.30 and sleeps a decent chunk. He naps around 90 minutes and I always wake him by 2. He has previously slept through really well. However for about the past month he's been waking between 1 and 3 and remaining awake for 1+ hours. He woke at 3am this morning and it's nearly 6am and he's only just gone back to sleep. I'm at my wits end. I've tried longer naps, shorter naps, earlier bedtimes, later bedtimes. He has a dark room, he has white noise, he's eating plenty, he's warm enough, I've given meds in case it's teething related, he has a comforter and water. If I try to bring him in bed with us he gets hysterical. Most of the advice I can find for this age relates to bedtime battles rather than overnight wakes which isn't relevant to us as we don't ever have an issue at bedtime.
I'm really at the end of my tether from lack of sleep and don't know what to do any more.