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.
Differences between a law and a theory include that a theory is much more complex and dynamic, laws describe, theories explain, and a law governs a single action, whereas a theory explains an entire group of related phenomena. âA scientific law is like a slingshot. A slingshot has but one moving part--the rubber band.