It’s probably not the clock you need to build if being punctual is your modus operandi, but it’s sufficiently nerdy nonetheless. One Nirav Patel — which may or may not be related to our own Mr. Patel — decided to hand craft his own “sleep remaining indicator,” which utilizes a slowly rotating servo, a laser…

Here is the original: 
Laser-based ‘clock’ shortens beam as wake-up time draws closer