27049 Why sleep?
Monday, April 27th, 2009Why sleep?
Do you remember your Mom and Dad telling you to go to bed and get to
sleep so you could do well in school? It turns out they were right
again.
Sleep has an affect on how we feel, look, and perform in our everyday
tasks. As anyone who has gone a few nights without sleep can attest to
it has a big impact on our quality of life. Just ask any young parent
now taking care of their newborn child.
Sleep quality and quantity are equally important. With a shorter
sleep period, the body has less time to repair the muscles and
consolidate the memories of the previous day. Without adequate sleep
each night, the body is less able to concentrate or make good
decisions at work or in school.
Athletes need to realize growth hormone release occurs during this
time. These hormones are absolutely essential for further physical
development.
How does sleep do all these things for our body?
Most of us already have read or know about the stages of sleep but in
case you’ve forgotten here’s a quick review.
High quality sleep, if given enough time, follows a distinct and
productive pattern of alternating REM, rapid eye movement and NREM,
non rapid eye movement throughout a normal night.
NREM makes up seventy-five percent of the nights sleep, and it does
it in four stages.
The first stage is that time between being awake and falling asleep.
This transitions into light sleep, which then moves us into stage two.
Stage two is the beginning of sleep where we become separated from
our surroundings in the room and our daily life. Our breathing and
heart rate settle into a regular pattern as our body temperature
begins to drop. This is where sleeping in a colder room may be
beneficial to getting a good nights sleep.
As we progress further into the sleep process stages three and four
begin. These are the deepest and most restorative periods of sleep
during the night. During this time, our blood pressure drops and our
breathing rate begins to slow down. These physiological responses are
accompanied by a relaxation in muscle tension. As the muscles relax,
the blood supply to them increases bringing with it nutrients to
repair the tissues.
The growth hormones mentioned earlier now begin to be released in
greater quantity than during the daytime. These are critical for
advanced growth and development throughout the body.
Now is the time, after the training sessions are over for the day,
when muscle, tendon, and ligament growth takes place; in effect, a
rejuvenation of the neuromuscular system occurs during high quality
sleep.
Following directly after the NREM portion of our sleep is the REM,
which takes up approximately twenty five percent of the nights rest
time. REM takes place about ninety minutes after falling into the
light sleep.
