Figure 5.

Changes in sleep duration after sleep deprivation. Each faint “X” denotes a mouse that underwent a 2 h deprivation and is included only as a reference. Left and middle panels show the difference (in min) in NREM amount and NREM episode length during the first 4 h of recovery sleep (starting at noon) relative to the first 4 h of baseline sleep (starting at 8 a.m.), while the right panel shows changes in REM amount during the first 8 h of recovery sleep (from noon until lights-off at 8 p.m.) relative to the first 8 h of baseline sleep. Triangles indicate group mean different from 0 (paired 2-tailed t-test; filled symbols p < 0.05, empty symbols p < 0.1).