Not sure why with time I found that pillow shape/size started to impact my sleep... Everything actually impacts it- I've started changing temperature, eating times, stopping drinking liquids at 6pm etc... These pillows are an effective part of the formula. What the description doesn't list as the secret: they are very very heavy. They have mass, and the mass holds its form due to the design. Although heavy, they are soft feeling. Due to the mass, they hold their form and this makes sleeping better since you dont wake up with a scrunched piled of nothing under your head...
They absolutely help sleeping- they seem strange due to their weight- but this actually works...