My LO loves the vibrate feature on her rock n play and bouncy seat and it helps her go right to sleep. She was doing great in her crib from six weeks on and now we are in the midst of a horrendous sleep regression. So after getting up with my LO for the umpteenth time the other night I found this on Amazon (what CAN'T be found on Amazon?!). Anywho its a crib mattress vibrator. I am trying it out tonight and I will let you know how it goes! Praying for more than 3 hours of combined sleep!
https://www.amazon.com/Munchkin-Lulla-Vibe-Vibrating-Mattress-Pad/dp/B009UPUFCY