The impact of daytime naps was looked at by Walker and Stickgold (2005).[40] The experimental group was given a 60-90 minute afternoon nap (one full cycle), after a motor skills task learned that morning, while the control group received no nap. The nap group improved 16% when tested after their nap, while the no-nap group made no significant improvements. However, it seemed to all even out after that same nights sleep; the no-nap group improved 24% and the nap group improved only 7% more for a total of 23%, virtually identical.