Two early signs of dehydration are thirst and dark-coloured urine. This is the body's way of trying to increase water intake and decrease water loss. Other symptoms may include: 1  dizziness or light-headedness. 2  headache. 3  tiredness. 4  dry mouth, lips and eyes. 5  passing small amounts of urine infrequently (less than three or four times a day).
Diurnality is a form of plant or animal behavior characterized by activity during the day, with a period of sleeping, or other inactivity, at night. The common adjective used for daytime activity is diurnal. The timing of activity by an animal depends on a variety of environmental factors such as the temperature, the ability to gather food by sight, the risk of predation, and the time of year.
Dictionary entry overview: What does cycle mean? â¢ CYCLE (noun) The noun CYCLE has 6 senses: 1. an interval during which a recurring sequence of events occurs 2. a series of poems or songs on the same theme 3. a periodically repeated sequence of events 4. the unit of frequency; one hertz has a periodic interval of one second