Self-Defeating

The Kindle or iBooks version of The Harvard Medical School Guide to a Good Night's Sleep is on sale today for $1.99.

This product would be self-defeating in my case:
1) I do most light reading right before bedtime and
2) Reading on a tablet worsens sleep.
3) Of course, reading the book during the day---and acting on its advice---might bring its own untimely problems.