Today's labor market is characterized by flexibility. This applies to organizations, forms of employment and working time. Unregulated working time is such an adaptation and the main subject of this essay. The purpose of this study was to investigate the conditions that underpin unregulated working time, in relation to the Swedish legislation and to EU legislation. The intention has been to investigate the work environment impacts of unregulated working time, and what differences there are from a gender perspective. The conclusion is that workers who enter into agreements for unregulated working time have significantly different terms from traditional workers. Workers with unregulated working time are exempted from the working time law and so even the provided safety net. A frequent part in agreements of unregulated working time also means that the employee agrees to an elimination of compensation for overtime work.Unregulated working time is appropriate for workers who have working tasks that they can adjust to their working time. Workers with controlled working tasks have not the same opportunity, which increases the risk of perceived ill health. Unregulated working time is therefore not suitable for all forms of employment. More scientific research is needed in this area, but based on the available scientific research, there are indications to suggest that women are overrepresented among those occupations. It would then also mean that womenare at greater risk of ill health than men.