Do you function better first thing in the morning or after staying up late at night?
Researchers at the University of Colorado have been studying that. They asked healthy adults to solve simple math problems after 8 hours of sleep and then again after no sleep for more than a day. The results might surprise you.
"What we found was that when they first wake, a person's performance is actually worse than after 26 hours of total sleep deprivation," said Dr. Kenneth Wright, University of Colorado.
Dr. Wright, who led the research, says they found that "groggy" feeling when you wake up lasted about 10 minutes for some people, but up to 2 hours for others...something to consider if you're trying to get in a little cat-nap before a test.