To go with what Assassin says, crying is one way that the babies use to "shut out the world from over stimulation".
Their little brains can only take so much. If you have television on, music, friends over... little babies need a certain amount of "quiet time".
In saying that, it also took me 2-3 babies to learn that.
The other thing about waking 8 times a night, which you probably already know, the "depth" of sleep is a "sin wave" during the night:
And at the "lighter sleep" times, he/she has learned that the only way to get back to sleep is with the help of mummy or daddy. It is up to you to teach them differently. Just leave them alone. They will get back to sleep.
With my first baby, i was adamantly oppose to using a dummy. With my second, I was addicted to it, because by then there were two waking during the night A 2 hour sleep block was a blessing!
The second child had learned to lull himself back to sleep. Thats what everyone has to learn at some stage. The earlier the better for babies, because without sleep, you as a mummy wont be a very functioning mummy. You are doing no-one any favours by "suffering" through this.
Nowerdays there are even some parents who will lie next to their 3 year old every night "because the child wont go to sleep any other way". The kids have learned that this is "how i sleep". That the rule. Try breaking the rule, the kid of course objects: this is what I know, she says.
With the extreme sleep deprivation, our neighbours (kids 18 months apart) took to swapping getting up. One gets up one night, the other the next night. They slept in separate rooms.
Their marriage was saved through this!
PS: one of our kids, I cant remember which used to always cry themselves to sleep. It was their way. Some people are like that. When they started crying, I knew they were about to drop off. I learned NOT to pick them up.
http://www.mamamia.com.au/parenting/...eep-whisperer/
http://www.independent.co.uk/life-st...p-2303593.html