Every now and then after dinner, I take the Nintendo DS out of its case and play a few rounds with the brain gym. And I've learned that my intelligence fluctuates even worse than a serial dieter's weight.
Sometimes I'll take the test, and do astonishingly well in the Calculate section but not so well in the Memory section. Other times, my Calculate score is shameful, but my Memory seems to have made a comeback.
In part, this is to do with which sets of tests I get. But I think it's even more influenced by how tired I am, how loud the television is and whether I can hear TLM having a nightmare in the next room.
It makes sense, really, but I'd never realised how much difference it makes. So I suppose the idea of studying in the evenings might not be a very good one eh?