I hadn't mention that in the following days he would gladly take my (or mommy's) little finger and fall asleep right away, and wake up again when I took it out of his mouth.
Well, he's now -maybe- accepting (only) one of the many pacifiers he's got, for short periods of sucking when he's more than ready to go to sleep. The thing keeps falling out of his mouth, but at least he's more tolerant.
Also he seems to be a lot more vocal lately, he almost laughs, smiles a lot and is very, very, oh so very alert.