We LOVE the Sleep Sheep in this house. My FIL bought it for DS on a whim because it was cute and we've used it every single night since. DS is 2 now and turns it on himself when he goes to bed. We're definitely buying another for DD.
Its a white noise machine with four different sounds. The sound box is removable for travel, but there is also a smaller version if you want. We use the waves and it puts him right out.