Tatiana does not sleep in our bed for HER safety, not ours. We have a tall, huge Cal-king size bed with heavy comforters. I worried Tatiana may be smothered by the covers (she's a tiny, 3 lbs dog), or be pitched off the bed onto the hardwood floor. Incidentally, my husband and I are sound sleepers.
Tatiana sleeps in an exercise pen by my bedside. She has a comfy wooden trundle bed where she's safe.