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That's so nice of you, thank you! I haven't heard of Aging 2.0 but will check it out.
No, the LEDs don't emit noticeable heat. The computer chip does (see my last section for details) but not enough to warm the pillow. I'm with you that it could be a cool (uh...warm) feature and looked into some options but didn't try anything
Web-connected Glow PillowsView Instructable »
PCB Concepts and Materials
Circuit Board Design Class