A.F.
My son went through something similar. (He is now 10.5 months old) He was never a really great sleeper to begin with but last month he was having nothing to do with sleep...up at least once a night and up for good around 5:45 am YIPES....but, now all of a sudden he is a great sleeper! Who knows....I wonder if it has something to do with a growth spurt? Teething? Or just a phase...
Good luck and I am sure it will be something else next month. :)