Sleep (UC Berkeley)

Sleep improves motor skills by 20% (picture above). It is also noted that motor memory skills depend on the duration of 4th cycle NREM (picture below)
Relationship between long chained pairs shown/learned. Recalled accuracy is shown [above]. 
1st and 2nd degree inference (based on the possible chain) recalled accuracy is shown [below]. This shows the importance of sleep for better memory integration.
Picture [above] shows how sleep deprivation skews positive and negative emotional stimulus.