This article is about devices that can supposedly help you get more out of whatever hours of sleep you manage to get. It sound suspicious, but appears to be backed by at least some research and scientific/medical opinion.

One of the most promising techniques to do so works a bit like a metronome counting the brain into the correct rhythms. Experimental participants wear a headset that records their brain activity and notes when they have started to make those slow waves. The device then plays short pulses of gentle sound, beginning in sync with the brain’s natural slow waves, at regular intervals over the night. The sounds are quiet enough to avoid waking the participant, but loud enough to be registered, unconsciously, by the brain.

BBC

One of the devices commercially available is made by Phillips and costs around $370 (I do not get any sort of commission if you click on this link or buy one.)