Slumbered Sleep

FIGURE 29
The amount of sleep required each night reduces
from thirteen to eleven hours between the ages
of two and five. By the age of six, children will
start to show preferences for their circadian sleep
phases and tend to be either early birds or night
owls. According to one study, youngsters spend
more time in stage N3 than teenagers because
they seem to have a longer duration of REM
sleep. Teenagers need 9 to 10 hours of sleep per
night on average. Slow-wave sleep and sleep
latency time decrease, and time in stage N2 increases,
as a result of several hormonal and pubertal
changes. In comparison to early stages of
puberty, daytime sleepiness increases during the
middle of puberty. (Patel, 2022)
There are five sleep cycles,
each lasting around 90 minutes
and containing a different
stage of sleep, in a typical seven-to-eight-hour
sleep period.
Stage 2, which is a relatively
light sleep, stage 3 and 4, also
referred to as slow-wave sleep
or deep sleep and REM sleep,
in which the sleeper is extremely
close to consciousness and
probably dreaming. The first
two cycles of sleep are dominated
by deep sleep, whereas
the third and fourth cycles are
dominated by stage 2 and REM.
(Dotto, 1996)
Wake, N1, N2, N3, and REM
are the first four stages of
sleep. Non-rapid eye movement
(NREM) sleep is defined
as stages N1 through N3, with
each stage resulting in a progressively
deeper slumber. A
typical night’s sleep consists of
4 to 5 sleep cycles, progressing
through the stages of sleep in
the following order: N1, N2, N3,
N2, REM. (Patel, 2022)
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