If you have trouble sleeping at night without your phone by your side, this Handsfree Bluetooth Pillow Phone should provide you with the peace of mind you need to really get a good night's sleep. Connecting to your phone via Bluetooth, it's basically a huge and extra-comfy Bluetooth headset, albeit one that you'd have trouble using while walking down the street.
Personally, I don't think I'd want to wake up in the middle of the night hearing my pillow ringing, and just keeping my phone on my nightstand seems to be working just fine for me. But hey, I guess that reach over to get your phone can be seen as an unnecessary exertion, and any way to avoid it should be considered a good thing. I'm looking forward to a time when every piece of electronics out there is somehow built into a bed so I never need to stand up at all. Make it happen, science.