Slumbered Sleep

FIGURE 32
REM (Stage 4) 25%
FIGURE 30
N2 (Stage 2) - Deeper Sleep (45%)
As your body temperature and
heart rate drop, you enter a deeper
state of sleep. The first cycle of
stage 2 sleep lasts for around 25
minutes, and it gets longer with
each subsequent cycle, making
up finally about 45% of total sleep.
The period of sleep during which
tooth grinding takes place.
REM sleep is not regarded as being
peaceful because it is connected
to dreaming. respiration rate becomes
increasingly unpredictable
and unreliable. Each of your REM
cycles lengthens during this period,
which typically begins 90 minutes
after falling asleep. Typically,
the first period is 10 minutes long,
while the final one might take up to
an hour. All dreams happen during
the REM stage. (Patel, 2022)
N1 (Stage 1) - Light Sleep (5%)
N3 (Stage 3) - Deepest Non-REM Sleep (25%)
FIGURE 33
More than half of the alpha waves
are replaced by low-amplitude
mixed-frequency (LAMF) activity to
signal the start of this stage of sleep,
which is the lightest. The skeletal
muscles have some degree of tone
and breathing usually happens at a
regular rate. One to five minutes, or
5% of the entire sleep period, are
spent in this stage.
FIGURE 31
Another name for N3 is slow-wave sleep. The signals in
this stage of sleep, known as delta waves, have substantially
higher amplitudes and lower frequencies which are
indicative of the deepest period of sleep. The most challenging
part of this stage is getting out of it, for some
people even loud noises will not wake them up. As people
get older, they often spend more time in stage N2 sleep.
Even though this stage has the highest arousal threshold,
if someone is awakened during it, they will experience
sleep inertia, a brief period of mental confusion. According
to cognitive testing, people who awaken during this
stage typically experience mild cognitive impairment for
30 to 60 minutes. During this phase, the body heals, and
regenerates tissues, develops bone and muscle, and fortifies
the immune system. Additionally, during this phase,
bedwetting, sleepwalking, and night terrors all occur.
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