i like having our crib, for a number of reasons. one is that i have a fairly bad back, and sleeping in one or two positions throughout the night is a recipe for pain and suffering the next day. another is that, indeed, my dd definitely seems to sleep as well if not better without the distractions of mom and dad. third, we often get an hour or so of quiet, independent play from her in the evenings before she is ready to sleep. she has a box of soft toys in her crib and will play happily for a little while at least, while DH and I get some down time. the crib is contained, comfy and signals restful evening play, as opposed to playing in the living room, for example. so, for our dd, at this moment in time, the crib is an important part of our nights. she comes to bed with us at her first waking, and generally stays the rest of the night with us, unless that first waking is earlier than normal, in which case i generally stay awake to transfer her back once she is done nursing. sometimes she doesn't wake at all, and sometimes she spends almost all night with us, if she's not feeling well.
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if we had a larger bed, and room to store our bed frame, i would consider having a king size bed on the floor a good alternative to our current arrangement, except, i do enjoy being able to read, use the laptop, and have time with my DH in our bed without worrying about waking the baby.
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anyway, every baby is different. you will never know what they will do until you try it. as for how i put her down, we also do a mix of awake and swaddled, lightly sleeping, and totally, completely dead to the world. she is quite flexible that way. i don't know what i would do if she generally woke more than once or twice a night to nurse. but i do think that she does probably sleep longer stretches in her own space.