That's interesting, reminds me of my DS who really needed a long pm nap in order to have a long-ish A to BT without getting OT, which would in turn result in a good night... If the pm nap wasn't long then he couldn't manage a long A to BT without getting OT so we'd either get OT wakings in the early evening or UT ones later on if we gave him EBT. I just wonder whether a nice long pm nap may be key for him, perhaps by limiting the am nap...it may seem a little early to do that but I also seem to remember that DS needed his am nap limited to 1h 10mins around 9mo in order to get a decent pm nap. Yours may need it shorter. Just a thought!