Just try and be consistent with your bedtime, sounds like you are being run ragged trying to keep up with each day! I only ever change Ryans bedtime if its a special occassion or if he has napped very late (and I mean like anytime after 4). Perhaps if you go over your 6hrs A time the rest of it needs to be calm like books, cuddles, maybe even a little TV, I have found especially after a lot of fun and running around at a park, Ryan really needs that chill on the couch watching some of his favourite programs.
Ryan used to take a while to fall asleep too, as long as he was not distressed or being really riotous I let him be to fall asleep naturally on his own.
So if you LO gets up at 6am today and your normal bedtime is 8 you can probably get away with a longer nap today between 12 and 2.30, if he wakes earlier from his nap than you would expect I would just make the wind down tonight very calm and relaxing, perhaps even having a longer bath, extra story to see how it goes.
Hugs!