Sleep affects many aspects of performance of an employee, especially in fast-paced and stressful environments. The pessimistic effect on continuing health and organizational behavior are caused by lack of sleep and poor sleep quality.Circadian rhythms affect sleep cycles and daytime performance. Environments that require considerable work can cause weak sleep quality as well as health issues. The consideration of uman resource including employee productivity,safety and health.

 

 Sleep is made up of quality and quantity,but when it comes to influence on day-to-day activities,both parts are equally essential.The quality s better than quantity when considering the workload and stress of the employee.The reason for poor sleep quality is social problems in the workplace,while work timetable can lead to a decrease in the amount of sleep.If you are sleeping disorder, the quality and quantity of your sleep is declining. Weak sleep quality and lack of sleep can both  develop your sleepiness,which can bring pessimistic influence your attainment of your work.

 

Circadian rhythums and sleep-wake cycle is interaction.Circadian rhythms are physiological and behavioral cycle that occurs in about 24hours. we want to sleep partly because of our physiological needs and partly because of our circadian rhythms.so circadian rhythms act like internal clocks and affect by light,diet and exercise.So if a job require you to change your regular routine,it may cause health problems.Because sharp change in the amount of light and temperature can affect the sleep and performance of polar workers, it can also lead to seasonal affective disorder and periods of depression . 

Short-term memory also named working memory. Different people have different memory abilities, which will determine their studying style. For instance, certain people are better at processing verbal, or spoken information, whereas others are good at treating visual information.

Compared with the short-term memory, long-term memory is the function by which can be divided into episodic and semantic categories. The former must have been experienced, such as childhood holidays, while the latter is a general knowledge of things, combining common sense of personal and the conception of things.

There are two ways to convert short-term memory into long-term memory. Rehearsal, one of them, is often known as repetition, such as actor practicing a drama. The other is visualization, it can be exemplified by imaging how information interact, like by creating a mind map, which are very effective visual study tools for helping.