Caffeine enhances memory consolidation

Caffeine enhances discrimination performance 24 h after study.

Post-study caffeine administration enhances memory consolidation in humans
Nature Neuroscience (2014). Published online 12 January 2014
http://www.nature.com/neuro/journal/vaop/ncurrent/full/nn.3623.html
Daniel Borota, et al.

It is currently not known whether caffeine has an enhancing effect on long-term memory in humans.
We used post-study caffeine administration to test its effect on memory consolidation using a behavioral discrimination task.

Caffeine enhanced performance 24 h after administration according to an inverted U-shaped dose-response curve; this effect was specific to consolidation and not retrieval.

We conclude that caffeine enhanced consolidation of long-term memories in humans.