Reinforcing Rhythms in the Sleeping Brain with a Computerized Metronome

If you are having memory problems ask your doctor why this wouldn't help.
http://www.cell.com/neuron/retrieve/pii/S0896627313003632

Summary

Sleep has many inherent benefits, including an important role in memory consolidation. In this issue of Neuron, Ngo et al., 2013b demonstrate that appropriately timed sounds delivered during sleep can invigorate electrophysiological oscillations conducive to memory stabilization.

No self-prescribing, you know how dangerous a non-prescribed metronome is.