© 2000-2019 Sleep Number Corporation SLEEP NUMBER, SLEEPIQ, SLEEP NUMBER 360, the Double Arrow Design, SELECT COMFORT, and IT are registered trademarks of Sleep Number Corporation. Read our full Sleep Number I-8 review. I-LE if Consumers Want More Cushion. According to the Sleep Number Customer representative, I talked to, the higher the model number, the more cushioning the mattress will have. So the I-LE has an extra layer of quilting foam sewn into the mattress top and has more cushion than the I-8. It took us a little time to find our Sleep Number and it ranges within 5-10 on the number scale, but overall its a great sleeping experience. I read a lot of reviews both good & bad before purchasing which helped with understanding how the bed works. It cut down the adjustment time considerably. I recommend reading the reviews before you purchase and considering all options. For us the iLE turned out to be a.