Table 2.

Sleep during the tDCS and placebo stimulation conditions of the Sleep experiment

tDCS (mean ± SEM) Placebo (mean ± SEM)
Awake % 6.0 ± 2.5 5.7 ± 1.3
S1 % 9.3 ± 1.7 9.6 ± 2.5
S2 % 46.9 ± 4.4 48.9 ± 3.6
S3 % 18.4 ± 2.1 16.6 ± 1.6
S4 % 16.6 ± 4.1 17.5 ± 4.2
SWS % 35.0 ± 4.2 34.1 ± 4.4
REM % 2.3 ± 0.8 1.2 ± 0.6
Total time (in minutes) 96.1 ± 4.9 88.6 ± 3.7
Latency to
S2 (in minutes) 3.6 ± 1.1 4.9 ± 5.4
SWS (in minutes) 25.4 ± 6.3 22.9 ± 3.7
  • Percentage (%) of time spent in different sleep stages and latency to stage 2 sleep, SWS, and REM sleep (with reference to sleep onset) is shown. Total time defines the time from sleep onset until awakening. There were no significant differences between the conditions.

    S1-S4, Sleep stages 1-4.