Total sleep (A) and quantification of number of dividing NBs (B) shows that the relationship between proliferation rate and sleep is mixed. Expression of UAS-Ras1V12or UAS-Alk in NBs (using worniu-GAL4) results in a comparable increase in NB division, but only UAS-Ras increases sleep. In contrast, expression of UAS-dp60 causes a dramatic reduction in dividing NBs, but sleep is increased. For sleep experiments, n=29, 41, 35, 22 larvae from left to right. For measurement of dividing NBs, n=18, 19, 14, 11 brains from left to right. ***P<0.0001. ANOVA with Tukey’s test. (We thank Dr. Sarah Siegrist for worniu-GAL4 and UAS-dp60).