Data from which conclusions  were  drawn  in  the  article  "Sleep  in 
Mammals: Ecological and Constitutional Correlates" by Allison, T.  and 
Cicchetti, D. (1976), _Science_, November 12, vol. 194,  pp.  732-734. 
Includes brain and body  weight,  life  span,  gestation  time,  time 
sleeping, and predation and danger indices for 62 mammals.



Variables below (from left to right) for Mammals Data Set:

species of animal

body weight in kg

brain weight in g

slow wave ("nondreaming") sleep (hrs/day)

paradoxical ("dreaming") sleep (hrs/day)

total sleep (hrs/day)  (sum of slow wave and paradoxical sleep)

maximum life span (years)

gestation time (days)

predation index (1-5)
                1 = minimum (least likely to be preyed upon)
                5 = maximum (most likely to be preyed upon)

sleep exposure index (1-5)
                1 = least exposed (e.g. animal sleeps in a 
                    well-protected den)
                5 = most exposed

overall danger index (1-5)
                (based on the above two indices and other information)
                1 = least danger (from other animals)
                5 = most danger (from other animals)

Note: Missing values denoted by -999.0


For more details, see

Allison, Truett and Cicchetti, Domenic V. (1976), "Sleep  in  Mammals: 
Ecological and Constitutional  Correlates",  _Science_,  November  12, 
vol. 194, pp. 732-734.


African elephant         6654.000 5712.000  -999.0  -999.0     3.3    38.6   645.0       3       5       3
African giant pouched rat   1.000    6.600     6.3     2.0     8.3     4.5    42.0       3       1       3
Arctic Fox                  3.385   44.500  -999.0  -999.0    12.5    14.0    60.0       1       1       1
Arctic ground squirrel       .920    5.700  -999.0  -999.0    16.5  -999.0    25.0       5       2       3
Asian elephant           2547.000 4603.000     2.1     1.8     3.9    69.0   624.0       3       5       4
Baboon                     10.550  179.500     9.1      .7     9.8    27.0   180.0       4       4       4
Big brown bat                .023     .300    15.8     3.9    19.7    19.0    35.0       1       1       1
Brazilian tapir           160.000  169.000     5.2     1.0     6.2    30.4   392.0       4       5       4
Cat                         3.300   25.600    10.9     3.6    14.5    28.0    63.0       1       2       1
Chimpanzee                 52.160  440.000     8.3     1.4     9.7    50.0   230.0       1       1       1
Chinchilla                   .425    6.400    11.0     1.5    12.5     7.0   112.0       5       4       4
Cow                       465.000  423.000     3.2      .7     3.9    30.0   281.0       5       5       5
Desert hedgehog              .550    2.400     7.6     2.7    10.3  -999.0  -999.0       2       1       2
Donkey                    187.100  419.000  -999.0  -999.0     3.1    40.0   365.0       5       5       5
Eastern American mole        .075    1.200     6.3     2.1     8.4     3.5    42.0       1       1       1
Echidna                     3.000   25.000     8.6      .0     8.6    50.0    28.0       2       2       2
European hedgehog            .785    3.500     6.6     4.1    10.7     6.0    42.0       2       2       2
Galago                       .200    5.000     9.5     1.2    10.7    10.4   120.0       2       2       2
Genet                       1.410   17.500     4.8     1.3     6.1    34.0  -999.0       1       2       1
Giant armadillo            60.000   81.000    12.0     6.1    18.1     7.0  -999.0       1       1       1
Giraffe                   529.000  680.000  -999.0      .3  -999.0    28.0   400.0       5       5       5
Goat                       27.660  115.000     3.3      .5     3.8    20.0   148.0       5       5       5
Golden hamster               .120    1.000    11.0     3.4    14.4     3.9    16.0       3       1       2
Gorilla                   207.000  406.000  -999.0  -999.0    12.0    39.3   252.0       1       4       1
Gray seal                  85.000  325.000     4.7     1.5     6.2    41.0   310.0       1       3       1
Gray wolf                  36.330  119.500  -999.0  -999.0    13.0    16.2    63.0       1       1       1
Ground squirrel              .101    4.000    10.4     3.4    13.8     9.0    28.0       5       1       3
Guinea pig                  1.040    5.500     7.4      .8     8.2     7.6    68.0       5       3       4
Horse                     521.000  655.000     2.1      .8     2.9    46.0   336.0       5       5       5
Jaguar                    100.000  157.000  -999.0  -999.0    10.8    22.4   100.0       1       1       1
Kangaroo                   35.000   56.000  -999.0  -999.0  -999.0    16.3    33.0       3       5       4
Lesser short-tailed shrew    .005     .140     7.7     1.4     9.1     2.6    21.5       5       2       4
Little brown bat             .010     .250    17.9     2.0    19.9    24.0    50.0       1       1       1
Man                        62.000 1320.000     6.1     1.9     8.0   100.0   267.0       1       1       1
Mole rat                     .122    3.000     8.2     2.4    10.6  -999.0    30.0       2       1       1
Mountain beaver             1.350    8.100     8.4     2.8    11.2  -999.0    45.0       3       1       3
Mouse                        .023     .400    11.9     1.3    13.2     3.2    19.0       4       1       3
Musk shrew                   .048     .330    10.8     2.0    12.8     2.0    30.0       4       1       3
N. American opossum         1.700    6.300    13.8     5.6    19.4     5.0    12.0       2       1       1
Nine-banded armadillo       3.500   10.800    14.3     3.1    17.4     6.5   120.0       2       1       1
Okapi                     250.000  490.000  -999.0     1.0  -999.0    23.6   440.0       5       5       5
Owl monkey                   .480   15.500    15.2     1.8    17.0    12.0   140.0       2       2       2
Patas monkey               10.000  115.000    10.0      .9    10.9    20.2   170.0       4       4       4
Phanlanger                  1.620   11.400    11.9     1.8    13.7    13.0    17.0       2       1       2
Pig                       192.000  180.000     6.5     1.9     8.4    27.0   115.0       4       4       4
Rabbit                      2.500   12.100     7.5      .9     8.4    18.0    31.0       5       5       5
Raccoon                     4.288   39.200  -999.0  -999.0    12.5    13.7    63.0       2       2       2
Rat                          .280    1.900    10.6     2.6    13.2     4.7    21.0       3       1       3
Red fox                     4.235   50.400     7.4     2.4     9.8     9.8    52.0       1       1       1
Rhesus monkey               6.800  179.000     8.4     1.2     9.6    29.0   164.0       2       3       2
Rock hyrax (Hetero. b)       .750   12.300     5.7      .9     6.6     7.0   225.0       2       2       2
Rock hyrax (Procavia hab)   3.600   21.000     4.9      .5     5.4     6.0   225.0       3       2       3
Roe deer                   14.830   98.200  -999.0  -999.0     2.6    17.0   150.0       5       5       5
Sheep                      55.500  175.000     3.2      .6     3.8    20.0   151.0       5       5       5
Slow loris                  1.400   12.500  -999.0  -999.0    11.0    12.7    90.0       2       2       2
Star nosed mole              .060    1.000     8.1     2.2    10.3     3.5  -999.0       3       1       2
Tenrec                       .900    2.600    11.0     2.3    13.3     4.5    60.0       2       1       2
Tree hyrax                  2.000   12.300     4.9      .5     5.4     7.5   200.0       3       1       3
Tree shrew                   .104    2.500    13.2     2.6    15.8     2.3    46.0       3       2       2
Vervet                      4.190   58.000     9.7      .6    10.3    24.0   210.0       4       3       4
Water opossum               3.500    3.900    12.8     6.6    19.4     3.0    14.0       2       1       1
Yellow-bellied marmot       4.050   17.000  -999.0  -999.0  -999.0    13.0    38.0       3       1       1

The above data set can be freely used for non-commercial purposes  and 
can be freely distributed (permission in  writing  obtained  from  Dr. 
Truett Allison).

Submitted by Roger Johnson
rjohnson@carleton.edu
