my 13 wo is still only able to stay awake for an hour tops before he's cranky. i have to watch his cues very closely or else he's overtired and in meltdown mode (similar to what your son did, sounds like) i have found that if i keep his morning A activities quite low-key (sometimes not even leaving his bedroom, just talking to him and singing with the lights low) then i'm not only able to notice his cues easier, but he also goes down easier. i'm really ready for him to extend his A time because 1 hour seems so little, but i tried that the other morning and ended up with a screaming baby all day long!! best to watch his cues and then, once you find that you've got the hang of it, watch the clock a little as well. that helps me when his cues are hard to read.