What's he doing at that NW? Yelling for you? Are you using those ear plugs m' dear?
His NW could just be developmental/habitual at this point, it's so hard to say because he does it so often. But maybe it was too much sleep on Fri? That's a LOT of sleep for him, uninterrupted. Maybe you have to wake him at 11.5/12 hrs? Maybe even 11, with his 1 hr NW he's getting 11 hrs almost yeah?
Do you think it's some UT leading to OT?
Laura, you are not doing anything wrong hon. At his age it's really just out of your hands, it truly is. You can only do what you can do and you have done that...and more.