Toys for the weekend--or before. Games for the Brain
If you are at all like me and spend hard time conquering a new technology or wrapping your head around a foreign concept or worrying about your finances, you probably find that taking a vacation or even just a break doing something totally devoid of that specific kind of thinking gives you the distance and perspective to tackle the problem afresh. That's what hobbies and travel and sleep AND computer games are for--aerobics for different parts of the brain.
Try some of these if you just have a ten minute break. They are fun. Each one calls for a different way of coming to an answer. Some require memory, some making odd connections. I haven't tried them all, but I will--though I may skip the memory ones so as not to become too depressed. js