Adjusting To a Martian Day More Difficult Than Expected

schwit1 writes: Research and actual experience have found that adjusting to the slightly longer Martian day is not as easy as you would think. "If you're on Mars, or at least work by a Mars clock, you have to figure out how to put up with the exhausting challenge of those extra 40 minutes. To be exact, the Martian day is 24 hours, 39 minutes, and 35 seconds long, a length of day that doesn't coincide with the human body's natural rhythms. Scientists, Mars rover drivers, and everyone else in the space community call the Martian day a "sol" to differentiate it from an Earth day. While it doesn't seem like a big difference, that extra time adds up pretty quickly. It's like heading west by two time zones every three days. Call it 'rocket lag.'"

Comments

So live underground

[Anonymous Coward]

...and keep all the lighting on a 24 hour cycle. All the drawings I see of colonies on the moon or Mars all have buildings on the surface. Don't they both have cave systems? Just seal those off and who cares about the outside climate/seasons?

Re:So live underground

[Anonymous Coward]

What every basement-dweller already knows.

Re:So live underground

[pr0fessor]

I think the biggest problem would be those on the mars days are here on earth and all the life around them is moving on the regular earth cycle... I can't have lunch at my favorite restaurant, go to the bank, etc... because my days are out of sync. Those people in the Arctic Circle are all on the same clock as businesses and everyone else around them.

Re:So live underground

[CycleMan]

Interesting. I had read that they adjusted to a 25 hour day, not 30. My source: Richard M. Coleman's book, Wide Awake at 3:00 A.M., page 8, "The results of these sleep-wake cycles shows that most subjects averaged a 25-hour day - that is, left on their own, free from time cues, humans have an internal day length of 25 hours." The problem isn't the Martian day, which is much closer to our natural biorhythms; it is trying to work a Martian time schedule while living on Earth with its time cues.

You get used to it.

[Penguinisto]

Seriously - people aren't as fragile as TFA surmises. In the spelunking world, cavers have discovered that after a few weeks without a day/night reference, their circadian cycles stretched out to a 24/24 cycle. In the case of a newly-minted Martian, it won't go that extreme, which means that at least within the timeframe of an exploratory journey, it would be no big deal, and they can adjust between the two on the way there and back (there's plenty of time on the journey to do that.)

Long term is a bit more difficult to predict, but only in how it affects the body overall. It would certainly adjust and stay adjusted, but I can guess (with no evidence either way) that the effect would be no different than Daylight Savings Time cycles would have on the typical adult here on Earth.

Re:You get used to it.

[Trax3001BBS]

I can't post (new design) only reply so picked on you :) .

Ever been to Alaska?

Walk out of a bar at 4am and it's as bright as noon is very freaky, and your ready to start the day over.

Noon during the Winter is dark as midnight. Cabin fever is very real in Alaska when one lives far from anyone else (very common), the reason pot was legalized, it gave an alternative to drinking, as alcohol was being abused for relief.

40 extra minutes of daylight? pffft

Re:You get used to it.

[Anonymous Coward]

I agree about people not being as fragile.
When you deploy on a submarine you go months at a time on an 18 hour day set to GMT. To make it worse there is no light or sun to reference day or night and certainly no reference of weekday or weekend. The only reference you have of what time it is was the type of food being served. Breakfast was always at 6 AM and was traditional breakfast food, lunch at noon was lunch food and so on. The funny thing is with the 18 hour personnel schedule, one day breakfast was your first meal, the next day it was your "lunch" and the third day it was your "dinner".

Re:You get used to it.

[CrimsonAvenger]

No you don't. Your watch rotates on an 18 hour cycle, but the boats 'day' (and overall schedule) remains on the standard 24 hour cycle. On top of that, you make the swap from Lima (local time) to Zulu (GMT) once when you leave port and again when you enter port (days, weeks, or months apart)

Irrelevant. You roll out of your rack, go to your watchstation for six hours. Then you do PMS/training/whatever for six hours. Then you sleep for six hours. Repeat till you get back in port.

In other words, you live on an 18-hour day for the period of your patrol.

As I recall, it took two to five days to adjust at each end of the patrol.

Wrong conclusion

[hackertourist]

Living on Mars time is difficult when you're living on Earth and are subject to Earth's day/night cycle.

Sensory deprivation experiments where people live without clocks and daylight for more than a few days show that people tend to lengthen their "day" to much more than a Mars sol (up to 36 hours IIRC), indicating that adjusting to Mars time is feasible when you're actually on Mars.

Re:Wrong conclusion

[Kjella]

Living in Norway + artificial light + student life with no real commitments I found that my natural cycle is more like 24/12 = 36 hour days than 24. In fact, without alarm clocks I'd have a helluva time staying on the same page as everyone else. The problem is that that sooner or later that clashes with real life and you must get up in the "middle of the night" for a family dinner or you get up in the "morning" and start drinking at a party which messes you up. On Mars making it another 40 mins would be the least of my worries.

Re:Wrong conclusion

[epine]

I have a circadian rhythm disorder. Not long ago I free-ran at 25.5 hours for several years. Advancing by 1.5 hours per day, you're making adjustments to the world around you ever two or three days. Endlessly. I would have mortgaged a minor limb to change my rotational period from 17 days to 21 days. Just to be able to stay in a consistent phase with the day of the week would have been a major blessing.

I had previously tried melatonin with mixed success. At best, having exhaustively worked through many doses and times, it seemed to reduce my period to 24.25 hours, a little less than 2 hours per week. This is no bed of roses, either. And the melatonin was taking a three hour chunk of out every evening where I was yawning like a date-raped hedgehog waiting impatiently for a fresh coat of paint to dry in his homey bungalow, listless and unable to anything more complicated than cook dinner—usually a fairly simple dinner.

Recently I tried melatonin again in a sustained-release formulation (newly discovered at retail) and this magically worked much better. At a large dose, I'm able to stay on a 24-hour day permanently, over very close to it. The daily date rape continues to suck.

At lower doses—minus the daily date rape—I seem to stay near a 24-hour day, with unplanned excursions when it all comes unglued. This might well be addressed by further tweaking. I've ever so close now to having the best of both worlds.

The operative parameter with circadian rhythm disorder is that there's no such thing as "merely" a flesh wound for a haemophiliac. My clock drifts because there's something broken in the entrainment circuit. A haemophiliac bleeds because there's a gash or puncture or rash, but he continues to bleed because the blood chemistry required for blood clotting is MIA.

A normal person experiencing severe jet lag (say a trip to Japan or Australia) is in a horrible, unpleasant, barely functional place. In my metaphor, you feel weak because you're gushing blood. In this state, your clotting reflex (if you have a clotting reflex) is actually on overdrive. The stress is horrible, but the body is rapidly adapting and compensating. If you make it through the first day, you hope the second day will suck a little bit less, until after a few days, it hardly sucks at all, then you're body finishes making the adjustment, and everything becomes normal again.

For a person such as myself trying to maintain a 24-hour day without melatonin, the process goes the other direction. Light jet lag turns in moderate jet lag, and moderate jet lag soon becomes severe jet lag, and severe jet lag soon gives way to waking hypnagogic hallucinations. Every one of my attempts to force myself into adherence with the 24-hour clock on will-power alone developed along this path over two weeks. I was as cognitively impaired at this point as that time I got a bit too carried away in a bout of binge drinking, to an extent I never repeated again. And still the bleeding continued. By this point your will-power is so diminished, you need a jeweller's work bench and a steady hand to make even the smallest life decision. You know you're suffering like hell, but you've almost forgotten what crazy notion drove you to try maintaining a 24-hour waking day.

From French invasion of Russia:

The cold was so intense that bivouacking was no longer supportable. Bad luck to those who fell asleep by a campfire! ... One constantly found men who, overcome by the cold, had been forced to drop out and had fallen to the ground, too weak or too numb to stand. ... Once these poor wretches fell asleep they were dead. If they resisted the craving for sleep, another passer-by would help them along a little farther, thus prolonging their agony for a short while, but not saving them, for in this condition the drowsiness engendered by cold is irresistibl

MiB

[XanC]

The twins keep us on Centaurian time, standard thirty-seven hour day. Give it a few months. You'll get used to it... or you'll have a psychotic episode.

Uh...

[dpidcoe]

These people were trying to adjust to a martian day while still living on earth and seeing the sun still operate on a 24 hour day, so of course they're going to have problems. I'd like to see this tried while keeping the people underground with the lights cycling to actually simulate a martian day.

Sign Me Up

[Warhaven]

40 extra minutes of sleep each morning? Yes, please!

Let's stay focused, people

[puzzled_decoy]

It's not the length of a day that will impact Mars-dwellers the most, it will be their internet speed.

DST

[stafil]

Let's fix it on Earth fist, and stop fucking with our circadian cycles twice a year!

Solution is already in the works

[NEDHead]

When the planet is bombarded with comets as part of the terra forming effort, a judicious selection of impact angles will easily speed the rotation to a nominal 24 hour rate