For the first time! He is six months old and we (ahem, I) had got into the habit of feeding him every time he woke during the night So I went zero tolerance the night before last and left him to cry...then last night he never woke me at all, just slept straight through!
I've now got that "had too much sleep" groggy feeling - it's been a long time since I slept six hours in a row!