The next subcategory was tiredness, that being tired results in
more risk-taking. The workers described that tiredness can be
influenced by amount of sleep, time of the day because of shift
work, the hot work environment, and slumberous sounds from
machines. This was, for example, described as follows: ‘‘We are
shift workers, and one can be terribly sleepy sometimes,’’ and
‘‘Four o’clock in the morning, one does not think so damn well’’
(HRTM, 2), and ‘‘Perhaps one is tired and does not think before acting,
being poorly prepared for work’’ (BM, 4).