serta memory foam three helped me sleep through the night. i loved this mattress! it was super fantabulous i was super great!! i really enjoyed the softness and ithe comfort!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! it helped my back problems that ive had since i was a little girl. nothing has ever helped my back problems until i got the serta memory foam three matress!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! it was also somewhat inexpensive and definatly worth a billion dollars!!!!!!!!!! it was very heavy to put on my box springs but that was ok! it also had a new plasticy smell...