Showing posts with label space. Show all posts
Showing posts with label space. Show all posts

Thursday, June 3, 2010

Sleep monitored in 520-day mock Mars mission


Six men parted ways with their families and the comforts of earth to embark on a landmark journey to the red planet Thursday morning. The mission will last exactly 520 days, enough time to reach Mars, spend a month on the planets surface, and return home to Earth. At its closest point in orbit, the planets are about 55 million kilometers apart. However the space capsule’s crew will only move a couple hundred feet.

The mission, in reality, is a great experiment in confinement taking place inside a facility near Moscow. The space vessels, the living quarters and the red planet itself are all fakes.

It's an exercise in space madness, borrowing the term from the old sci-fi B-movies. The entire time a team of scientists will be monitoring their every move and measuring their mental and physiological responses.

One of the signs scientists will closely watch is the crews sleeping patterns. The test subjects are wearing a wrist Actiwatch.

As previously reported on this blog, sleeping in space is not always easy. Astronauts on average sleep only 6.5 hours per day. The sleep quality is generally poor, with less time spent in slow-wave sleep. After three months the sleep problems are likely to worsen.

The light-dark cycle is highly variable. On normal missions near Earth the sun rises every 90 minutes. Similar challenges are likely apparent for interplanetary travel.

Then there is the issue of keeping a sleep schedule in tune with mission control. Presently astronauts use bright lights in their crew quarters during waking hours to regulate their sleep-wake cycle.

The Mars mission looks to shape the future of human space travel, despite being only a simulation. In the next 520 days we’ll learn if the human body and psyche is capable of making long journeys to new worlds.
Image Courtesy NASA

Sunday, April 11, 2010

Discovering Sleep in Space

Last week NASA launched space shuttle Discovery with a crew of seven astronauts. They headed to space April 5 on a 13-day mission to the International Space Station.

Last year the Sleep Education blog
reported that it can be a challenge to sleep in space. Now NPR’s Health Blog “Shots” reports that the challenge may be even greater for the crew on the current mission STS-131.

The astronauts had to synchronize their schedules with the crew on the space station. This requires them to work the “night shift” and sleep during the day.

To prepare they started changing their sleep schedules weeks ago. They also used bright lights in the crew quarters during the nights when they were awake.

The mission will provide scientists with more details about how astronauts sleep in space. The
research is being led by AASM member Dr. Charles Czeisler.

The experiment monitors their sleep-wake pattern using actigraphy. Test subjects wear a wrist
Actiwatch during the mission.

It records their activity and exposure to light. This information is compared with data collected before and after space flight.

Learn more about
space sleep from NASA. Read more about sleeping provisions for astronauts.

Image courtesy of NASA

Tuesday, July 28, 2009

Sleep in Space

Space shuttle Endeavour launched on Wed., July 15, from NASA's Kennedy Space Center in Florida. Today the shuttle undocked from the International Space Station.

After 13 days in space, how has the shuttle’s
crew been sleeping? Surprisingly well, MSNBC reports.

"We sleep very well in space,” Endeavour astronaut
Julie Payette told reporters. “Can you imagine? We have a sleeping bag each, and when you get into it you float in the sleeping bag...So all you have to do is just attach it somewhere."

Astronauts haven’t always slept so soundly in space. A 2001
study of five astronauts found that their average sleep duration was only about 6.5 hours per day.

Subjective sleep quality also was poor. They had less of the deep stage of
slow-wave sleep during the last third of their sleep period.

One challenge that can hinder sleep in space is the highly variable light-dark cycle. NASA reports that the sun rises every 90 minutes during a mission.

Long missions can be especially challenging. A 2001
case study found that space missions lasting more than three months may lead to more sleep problems.

What about waking up in space? That’s when the
Mission Control Center in Houston, Texas, gets involved.

It sends wake-up music to the space shuttle crew. This morning the wake-up song was “Proud to Be an American” by Lee Greenwood.

STS-127 is the 127th space shuttle flight; it is the 29th shuttle mission to the International Space Station.

Endeavour is scheduled to land at Kennedy Space Center on Friday at 10:47 a.m. EDT.

Learn more about
space sleep from NASA. Read more about sleeping provisions for astronauts.

Image courtesy of NASA