Fig. 4From: Assessment of effects of total sleep deprivation and subsequent recovery sleep: a methodological strategy feasible without sleep laboratoryAlertness-scores. a Tonic alertness (reaction times (ms) in a test without warning signal). b Variability of reaction times in the tonic alertness test (ms). c Phasic alertness (reaction times (ms) in a test with warning signal). Results are presented as M and SDBack to article page