Among older people, dehydration is one of the most common hazards of hot, humid weather. See what you can save with the AARP Auto Buying Program. Recent studies have found that even mild dehydration comes with big consequences â from altered mood and impaired memory to headaches and constipation.
diurnal - of or belonging to or active during the day; diurnal animals are active during the day; diurnal flowers are open during the day and closed at night; diurnal and nocturnal offices. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
Diurnal organisms are those that are active mainly during the day. When activity patterns of an organism occur in cycles of about twenty-four hours, the pattern is called a circadian rhythm.iurnal animals, which sleep during the night and are active during the day, or, conversely, nocturnal animals, which sleep during the day and are active at night, follow a circadian rhythm.