causes of tiredness n lazyness: 1)lack of häemoglobin/iron (e.g, anaemia) 2) obesity 3)lack of physical fitness 4)spicy n oily food (including excess amount of sugar) 5)alcohol 6)irregularity in daily life( change of biological clock very often) 7)stress 8)dehydration(loss of water) 9)other diseases( but often accompanied by other specific symptomps) ASTU!!!