Fatigue may be related to: 1  Use of alcohol or drugs. 2  Excess physical activity. 3  Jet lag.  Lack of physical 1  activity. Lack of sleep.  Medications, such as antihistamines, cough 1  medicines. Unhealthy eating habits.
Difference between a Regulation, Directive and Decision. Regulations have binding legal force throughout every Member State and enter into force on a set date in all the Member States.
For other uses, see Regulation (disambiguation). Regulation is an abstract concept of management of complex systems according to a set of rules and trends. In systems theory, these types of rules exist in various fields of biology and society, but the term has slightly different meanings according to context.