(Image credit: Saatva / Eight Sleep) The Saatva Solaire and Eight Sleep Pod allow you to customize your bed to suit your sleep needs — but they tackle very different problems via very different builds. If you're looking to give your bedroom a tech-makeover in the Memorial Day Mattress sales , there's a lot to learn about the Saatva Solaire Adjustable Firmness Mattress vs the Eight Sleep Pod 5. The Pod 5 is the latest temperature-controlling, sleep-tracking smart mattress cover from Eight Sleep, using water tubes to heat or cool the bed on demand. The Saatva Solaire, on the other hand, uses dual air chambers to adjust the feel of the mattress. And it does so via a luxury build similar to this year's best mattresses .…