Mark Zuckerberg built a glowing wooden box to help his wife sleep. Here are 3 similar gadgets you can actually buy.

The Philips Wake-up Light does exactly as its name implies: it wakes you up by gradually increasing the light over a period of 30 minutes, mimicking natural sunlight.

Unlike Zuckerberg's sleep box and the Casper Glow, the Philips Wake-up Light can combine lighting and sound effects to create an alarm. It was originally $139.99, but it's on sale for $104.99 right now.

While this device does show the time, it's a bit smaller and less noticeable than the clocks on some other competing devices.

Buy it here.

Accessory maker iHome's device is ideal for helping you fall asleep rather than waking you up. It's probably best for those who want to get a good night's worth of stress-free, uninterrupted sleep, rather than those seeking an alarm.

The $99 Zenergy Aroma offers a number of lighting effects, sounds, and aromas that it says will relieve stress and make it easier to relax. There's a flickering candle mode and a breathe mode, which emits a slowly decreasing red pulse. The device comes with a remote control.

Like the Casper Glow, there's no visible clock on this device.

Buy it here.