I believe in the power of the Sock Fairy. Sacrifice a small amount of laundry per day, and time travel should be no problem!

(When I was revising for my GCSEs (exams at age 15/16), I used to sleep with notebooks under my pillow - officially so that if I woke up and couldn't get back to sleep I could revise, and unofficially so that the knowledge would seep out of the books and into my head while I slept. I think it worked, too.)