Just another option:
We drive from NJ. We split the drive. We stop in GA or just inside FL. We check into a place we can use a coupon or get a
AAA discount and sleep well, wake early and arrive to WDW around the earlier time for check in. If you arrive a bit too early, they will hold your bags for you and you can just go ahead and hit the parks.
My thinking is that the kids would be too excited to sleep if we arrive later at night. This way, they are able to enjoy WDW as soon as we get there.
Just a thought.