Finally, I figured out how to make it stick. The answer is a five-year diary, also sometimes called a "one-line-a-day memory book." I got mine from a company called Letts, but get it from wherever you like, as long as it has these quite specific features: It should have 365 pages, one for every day of the year.
Before, I had diaries with great yawning pages of space to fill each day, and the prospect of laboring over an exhaustive account of everything I had thought, felt, or seen in the previous 24 hours. But with a five-year diary, you don't need to do very much.
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