Coffee beans you aren’t going to grind and brew within two weeks can be kept in the freezer, but they should not be stored in the refrigerator. Moisture isn’t good for coffee, well, unless you’re actually in the process of brewing. Don’t believe me? Here are a few insights from people much more informed than I...Link.
And loosely related, from The Point:
...it's not surprising that studies have shown caffeine is an effective aid.... For caffeine to be most effective, however, regular users need to minimize their caffeine use so that when they need it, caffeine will give them a boost.Link.