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Eveningness (delayed sleep period; most active and alert in the evening) and morningness (advanced sleep period; most active and alert in the morning) are the two extremes with most individuals having some flexibility in the timing of their sleep period. However, across development there are changes in the propensity of the sleep period with ...
Sleep recommendations suggest that adolescents should obtain 8–10 hours of sleep per night. Additionally, there is a shift in the body's circadian rhythm such that sleep and wake timings become later during adolescence. [2] Technology, social factors, and physical development are thought to contribute to poor sleep during this time.
Behavioral problems in childhood include the so-called regulatory problems, such as excessive crying, sleeping, and feeding problems, which occur in 20% of infants in multiproblem families. Excessive crying, whining and sleeping problems at 4–6 months are associated with decreased social development at 12 months. [1]
Interrupted sleep is a primarily biphasic sleep pattern where two periods of nighttime sleep are punctuated by a period of wakefulness. Along with a nap in the day, it has been argued that this is the natural pattern of human sleep in long winter nights. [9] [10] A case has been made that maintaining such a sleep pattern may be important in ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Language development. Vocabulary of 1,500 words plus. Tells a familiar story while looking at pictures in a book. Defines simple words by function: a ball is to bounce; a bed is to sleep in. Identifies and names four to eight colours. Recognizes the humor in simple jokes; makes up jokes and riddles.
Up until the age of 2 years, children who have been exposed to prenatal stress have shortened and disorganized sleeping patterns. [7] During early childhood development, the child's brain is particularly sensitive to adverse events such as family conflict, maternal postnatal depression, or abuse.
Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and ...