Table 1.

Vigilance states and slow wave sleep parameters in fur seals under baseline conditions

Seal 1Seal 2Seal 3Seal 4Mean
B2B2B1B2B1B2Seals 1–2Seals 3–4Seals 1–4
Waking (% of 24 h)78.479.675.770.963.568.579.069.674.3 (2.7)
SWS (% of 24 h)17.418.218.021.931.526.417.824.521.0 (2.1)
REM (% of 24 h)4.22.26.37.25.05.13.25.94.7 (1.0)
ASWS (% of 24 h)5.24.611.113.920.018.94.916.010.7 (3.5)
ASWS (% of SWS)30.125.161.763.563.471.827.665.147.6 (11.7)
SWS epochs with AI >0.3 (% of SWS)35.922.560.456.656.266.929.260.045.5 (10.0)
Episodes of ASWS <1 min (n/d)5658628210072577967 (6)
1–3 min (n/d)15921343626122921 (6)
>3 min (n/d)21172017122169 (4)
Maximal episode (min)7.77.010.010.335.719.3
  • Data are presented as individual values for one (B2; seals 1 and 2) and two (B1 and B2; seals 3 and 4) baseline days and mean values (for seals 1–2, 3–4 and all 4 seals) ± SEM (in parentheses). Only B2 values were used to calculate mean values. SWS, Slow-wave sleep; REM, rapid eye movement sleep; ASWS, asymmetrical slow-wave sleep; AI, asymmetry index; n/d, number per day.