Why T. still sleeps with us

We are trying, gently and carefully, to help T. learn to stay in her own bed all night long. She always wakes up every night, sometimes at 11:00, or 1:00, or 4:00--the times vary--but the results are the same. I rouse myself from my sleep to find her standing next to our bed, a small, breathless, frightened figure. I get up, take her to the potty, then bring her to bed with us, where she snuggles against my back with a deep sigh, arms closed tightly around my neck. [more]