Sometimes a person may be particularly alert or sharp, whilst at other times he or she may be muddled or absent-minded. Charity of mind might be affected by, for example, tiredness, time of day, distractions in the environment or distractions that result from doing other tasks . It may also be positively or negatively affected by drugs such as alcohol, nicotine or caffeine. A person's mood may also play a role here. For example, a person may be happy or sad, calm or anxious, aggressive or passive, delighted or outraged, etc.