We don't 'need' to lay with our 4 year old, but we do choose to. We lay in her bed with her and read a few books -- she is gone by the end of the second one usually. She sleeps all night in her own room but is welcome in our bed at any time.
My four year old still likes to be snuggled, but can go to sleep on his own. If I have work to do, I'll ask him to go to sleep by himself after reading some books, and he's generally okay with that. Most nights I or dp snuggle him down.<br>
I used to not do so, but then she finally gave up her pacifier a few weeks ago <img alt="" class="inlineimg" src="/img/vbsmilies/smilies/bag.gif" style="border:0px solid;" title="Bag">: , and asks me to do so. She has much more difficulty falling asleep these days, I guess it's understandable.