A study about relation between monotonous work and somnolence

Many subjects tend to fall into somnolence as they continue monotonous work. This report covers some noteworthy fact found in the lengths of time for the subjects to begin to doze. Our earlier research has made it clear that the occurance of grouped-α-wave can be used as an indication of somnolence in which the level of brain activities drops low. Needless to say, such time varies from one person to another. However, our experiment shows that most subjects, who slept for proper lengths of time the night before but who have not been specially trained for staying awake, begin to fall into somnolence in 20 to 30 minutes after starting work.