Noun
(psychology) nervousness resulting from mental stress
Source: WordNetThe nervous strain was far heavier in the case of our men who carried out the executions than in that of their victims. From the psychological point of view they had a terrible time. Paul Blobel
The real stumbling-block of totalitarian regimes is not the spiritual need of men for freedom of thought it is men's inability to stand the physical and nervous strain of a permanent state of excitement, except during a few years of their youth. Simone Weil
his responsibilities were a constant strain Source: Internet
the mental strain of staying alert hour after hour was too much for him Source: Internet