Contents

13 January 2010
Vol 2, Issue 14

About The Cover

Cover image expansion

ONLINE COVER The perils of sleep debt. Going without enough sleep is fine for a while because you can always catch up on the weekend, or after exams. Right? Not right, say Cohen et al. in this issue. Even when we have gotten a good night's sleep the night before, chronic sleep deprivation can severely impair our performance, especially when our circadian clock is in the downward part of its cycle. [CREDIT: JUPITERIMAGES.COM]