The symptoms of<unk>  can be quite varied, depending on the amount of time zone alteration, time of day, and individual differences. Sleep disturbance occurs, with poor sleep upon arrival and/or sleep disruptions such as trouble falling asleep (when flying east), early awakening (when flying west), and trouble remaining asleep. Cognitive effects include poorer performance on mental tasks and concentration; dizziness, nausea, insomnia, confusion, anxiety, increased fatigue, headaches, and irritability; and problems with digestion, including indigestion, changes in the frequency of defecation and consistency of faeces, and reduced interest in and enjoyment of food. The symptoms are caused by a circadian rhythm that is out of sync with the daynight cycle of the destination, as well as the possibility of internal desynchronisation.<unk>  has been measured with simple analogue scales, but a study has shown that these are relatively blunt for assessing all the problems associated with<unk> . The Liverpool<unk>  Questionnaire was developed to measure all the symptoms of<unk>  at several times of day, and this dedicated measurement tool has been used to assess<unk>  in athletes.<unk>  may require a change of three time zones or more to occur, though some individuals can be affected by as little as a single time zone or the single-hour shift to or from daylight saving time. Symptoms and consequences of<unk>  can be a significant concern for athletes travelling east or west to competitions, as performance is often dependent on a combination of physical and mental characteristics that are affected by<unk> . This is often a common concern at international sporting events like the Olympics and FIFA World Cup. However many athletes arrive at least 2-4 weeks ahead of these events, to help adjust from any<unk>  issues. Travel fatigue Travel fatigue is general fatigue, disorientation, and headache caused by a disruption in routine, time spent in a cramped space with little chance to move around, a low-oxygen environment, and dehydration caused by dry air and limited food and drink. It does not necessarily involve the shift in circadian rhythms that cause<unk> . Travel fatigue can occur without crossing time zones, and it often disappears after one day accompanied by a night of good quality sleep.
Jet lag
Lid lag
Mood swing
Moonrise 
Speech delay
Pathological lying
Far-sightedness
Pixl