Hi,
My ds has never had a problem with early morning wakings needing our attention, but he does wake early (dawn chorus time) sings and chats to himself for a while, then goes back to sleep on his own until some time between 7-8 am. I'm only really aware of this because I hear him when I get up to the loo - and I'm pregnant so this is quite often! I'm certainly not wanting to show off here, but I though if I tell you what we do it may help with your little ones waking so early. I've got to say that starting the day pre-4am is my idea of hell so I hope some of this works.
(BTW we followed the Gina Ford routines v. sucesfully for the first year and while I'm not suggesting you do too I should say where a lot of this is coming from.)
I agree with the idea that an early nap may be part of the cause of early waking. As well as it being part of the night time sleep becoming detatched from the rest of the night, if a child has a long morning sleep they will not want another nap until much later, and it may be too short to keep them going until bedtime or it will be too close to bedtime so bedtime gets really late. Then they are overtired at bedtime, fall into a very deep sleep early in the evening, and are restless through the rest of the night and may wake early. Plenty of day time sleep is really important, but we kept the morning nap short, at 8 months probably only 30 mins, so that the later, after-lunch nap was long, perhaps 2 -2.5 hours. Total sleep in 24 hours was then about 14.5 to 15 hours, 12 hours of this being at night.
As someone said, the more they sleep, the more they sleep.
We are strict about bedtimes and bedtime routine. We're more flexible now, but at 8 months ds was was nearly always in bed and asleep by 7pm.
We leave no toys, books, etc in the cot. I think if he has nothing to play with when he wakes up he's more likely to get bored and fall asleep again.
We never rush in the moment he wakes, ever. He's always been left to chat to himself for at least 10 mins. These days he will entertain himself alone in his cot for an hour after he wakes up so I can get showered, dressed, put the wash on, etc, etc. He thinks of bed as being a nice place to be and he regularly gets left there during the day for short spells while I do stuff.
His room is pretty dark but not pitch black.
He always, always falls asleep on his own, no rocking or feeding etc to sleep.
I did use cc to lengthen the after-lunch nap when he cut it back to just over an hour and he really needed longer, I think when he was about 6 months old. I went in every 10 mins and patted him and told him to go back to sleep. He didn't but after a couple of days he was sleeping much longer.
I really hope some of this helps. Please keep posting at tell us how you're doing.