Table 2.

Dataset on the ontogeny of sleep and cellular composition of the rat brain used in this study. (Values refer to both hemispheres together. Per cent of hours asleep from [5], age in days after birth; all other data from [32]. MBR, mass of the brain (excluding the olfactory bulbs). MCX, mass of cerebral cortex (including white matter). NCX, number of neurons in the cerebral cortex. O/N, ratio between numbers of other cells (non-neuronal cells, presumed to be mostly glial cells) and neurons in the entire cortex, including the white matter. DCX, neuronal density in the cerebral cortex, including the white matter. ACX, total surface area of the cerebral cortex (in mm2). D/A, ratio between neuronal density in the cerebral cortex (in neurons mg−1) and total cortical surface area (in mm2). n.a., not available.)

age% asleepMBR (g)MCX (g)NCXO/NDCX (N mg−1)ACX (mm2)D/A, (N mg−1 mm−2)
196.90.3090.13232 247 5000.193271 1271252163
298.60.3260.13832 406 6670.191265 8561292059
397.20.3870.16930 995 0000.171225 9401481528
493.20.4730.21539 763 3330.281184 5381741063
577.00.8260.41132 790 0000.20087 112267326
670.20.6830.32448 660 0000.091150 880228661
768.90.6750.32829 213 3330.48779 039230344
955.80.7850.34428 370 0000.54073 702237310
1052.70.9340.454n.a.n.a.n.a.n.a.n.a.
1152.21.0080.46717 200 0001.45237 561291129
1466.91.3420.64513 140 0001.23219 23836153
1568.71.1360.53415 030 0001.74428 13331888
1756.31.3820.68417 140 0002.43626 29337570
1859.01.3060.62015 225 0002.62624 56435270
2149.01.3420.62219 030 0002.14830 66235287
2254.21.4110.683n.a.n.a.n.a.375n.a.
2563.61.5360.70921 545 0001.99230 40238479