<human>: Can you summarize the given text in a few sentences?

So here's the deal. We have a two year old who generally goes to bed around 7pm, and is asleep by 7:30pm. He wakes up around 6am.

He has one afternoon nap that generally lasts about an hour and a half. So all in all, he gets around 12 hours of sleep per day.

The problem we've been having recently is that he's just exhausted during the day. If we let him, he'd have an afternoon nap from 11-1ish, and then be asleep by 6pm. We've tried letting this happen, just to see what the result would be, and he was up at 4am. Now he's even more tired as a result, since he needs a nap even earlier...it's like he's working on a 22 hour day instead of a 24 hour one.

We'd let him sit in his room until 7am in the morning or so, in the hopes that he'd fall back asleep after some whining/crying, but we have a 5 month old in the next room who wouldn't be able to sleep through it.

Does anyone have any suggestions?
<bot>: 2 year old won't sleep long enough. Letting him whine/cry until he learns to sleep long enough isn't really an option (though I'd take suggestions on that too). Help!