We brought our daughter home from China in July. It was clear from the 14 hour plane ride that the vibrations in the seat made her relax. Since she has so much trouble sleeping, I was so relieved to find this vibrating crib mattress. It is wonderful for getting her to sleep and getting her back to sleep when she wakes up screaming. The BIG problem for us is that it only vibrates for 15 minutes. Then it turns off. There is no way to change the setting. It's either on or off. I'm sure we would go through lots of batteries, but I would happily have the mattress "on" and vibrating all night if we could. Why go through the trouble of inventing this sanity-saving mattress, and then only give it one time setting? Seems to me that adding a few setting options wouldn't have been that difficult. Still, I don't know what we'd do without it.