snowjoke - (((hugs))) it must be tough trying to juggle your DS's routine along with an older child. Especially when her schooling activities fall right at a time when he will need to take his big nap of the day. I suppose all you can do is try & juggle it as best as you can. Perhaps in the mean time if all her schooling activities are in the afternoon, a long morning nap would work better for your DS, maybe at 10/10.30am, and then give him a shorter nap in the afternoon at around tea time ???
Vix206 - looking at your routine, here's what I think (and of course you can take it with a pinch of salt if you like!):
I would actually say that doing 6hrs either side of a 1hr nap is probably making him overtired. IME with my LO (also 18months) 1hr naps for us are always OT naps. For his age, his nap actually starts quite early, which means if he only sleeps for 1-1.5hrs max, then he is awake for a long time (6hrs) before BT. The combination of early nap AND long awake time to BT causing OT is probably what is causing your EW. So, IIWM I would do a couple of things:
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immediately bring BT earlier, to 6pm if he naps 1hr and 6.30pm if he naps 1.5hrs. This will hopefully help counteract any current overtiredness, and you may actually find he sleeps in til later in the morning. ANd even if he wakes at his usual time, he'll have had an hour's more sleep IYSWIM? This will then help you with doing the next step of the plan:
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after a few days of earlier bedtime, then start to gradually push his nap (and BT) later. So for 1 week, put him down at 12.15pm instead of 12. Try & keep the amount of time between his nap ending & bedtime at around 5hrs, so as the nap moves later, bedtime If he sleeps 1hr, do 6.15pm BT, if he sleeps 1.5hrs do 6.45pm. If he naps for longer (allow 2hrs absolute max) then I would do a later BT of say 7.15pm.
Then push nap to start at 12.30, and again push BT later (to 6.30pm if nap is 1hr) and to 7pm if nap is 1.5hrs, 7.30pm if nap is 2hrs. And repeat this routine for a week or two & see what happens.
I would also try & avoid the 2 nap days wherever possible as they are probably not helping the situation.
Hopefully, the later nap will stop him being overtired at bedtime, and will also encourage him to sleep in later in the morning. I have actually done exactly what I have posted above with my DS to fix his early waking & I can assure you it does work, but it can take a few weeks and a lot of overtiredness to get there.
We are actually now in the position with my DS where after 2 months of 7am WU, 12.30-2.30 nap and 7.30pm bedtime, he's started to wake at 6am, so I have now started to cap his nap at 1h 45 mins & this has sorted his EW again, so it may be that your DS is now at an age where he doesn't even need a 2hr nap anymore (1hr is on the short side but 1.5hrs really isn't bad at all). The key with the shorter naps though, is to keep the awake time between the end of the nap and bedtime shorter, to avoid overtiredness. I think if you can do this you will find things get a lot better.
HTH.x