After reading this Coolest Gadget article on bed sheets that can tell you what time it is via a braille like touch, I have to agree with the author that it is an interesting idea, but nothing more.Taking the time to feel your way around the numbers on your bed is probably way more work then just opening your eyes to read the clock.
With that said, I am still looking for new ways to make a clock's output more readable for those of us who have trouble reading clocks in the dark without our glasses.
I currently use a SharperImage clock that projects the time on the ceiling in large digits, which I can actually read, but the clocks alarm functions are less then optimal so I am always on the lookout for something better. I have my eye on HP's new DreamScreen 100 which would probably be a very nice step up, but is certainly overkill as an alarm clock and most likely suffers from "first-generation" issues based on the early reviews I have read. Though if HP would like me to review one I am more then happy to do so :)
So for now, the bed sheets clock is too light, the DreamScreen is probably too heavy, so I will stick with my current clock until I find the just right clock to tell me it is Goldilocks time.

