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Sleep Cycle App
12 years 5 months ago #11474
by Ona Kiser
Replied by Ona Kiser on topic Sleep Cycle App
"We have done a lot of testing in order to make Sleep Cycle work with two persons in bed. The short answer is: yes, Sleep Cycle works very well with two persons in bed. It could be a problem if the person using Sleep Cycle weighs much less than the other person but in normal circumstances it works very well.
There are two cases regarding this issue:
1) Sleep Cycle has a hard time detecting your movement.
In this case the movement of the other person will not be registered at all so there really is no issue. Sleep Cycle will work in a mode that uses all movement detected for the sleep analysis.
2) Sleep Cycle detects a lot of movement, from you AND the other person.
In this case Sleep Cycle will adjust it’s algorithm to only register larger movements. The small movements will be filtered. Since the other person is further away from the device these movements are smaller and will be filtered out.
Our extensive testing show that this works well."
There are two cases regarding this issue:
1) Sleep Cycle has a hard time detecting your movement.
In this case the movement of the other person will not be registered at all so there really is no issue. Sleep Cycle will work in a mode that uses all movement detected for the sleep analysis.
2) Sleep Cycle detects a lot of movement, from you AND the other person.
In this case Sleep Cycle will adjust it’s algorithm to only register larger movements. The small movements will be filtered. Since the other person is further away from the device these movements are smaller and will be filtered out.
Our extensive testing show that this works well."
12 years 5 months ago #11475
by Ona Kiser
Replied by Ona Kiser on topic Sleep Cycle App
If your cat lays ON the phone (which any cat will do instantly), your mileage may vary. 
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12 years 5 months ago #11476
by Chris Marti
Replied by Chris Marti on topic Sleep Cycle App
I'll download it and try it.
It reminds me in a way of fMRI studies - you have to take a leap of faith that what it actually measures (movement) is a good proxy for what we'd like it to measure (sleep cycle).
/skeptical thinking
It reminds me in a way of fMRI studies - you have to take a leap of faith that what it actually measures (movement) is a good proxy for what we'd like it to measure (sleep cycle).
/skeptical thinking
12 years 5 months ago #11478
by Tom Otvos
Fortunately (and I am not saying they actually did this), they could have calibrated the device using real EEG data, which is a pretty reliable indicator of sleep. Contrast that with our holy grail of fMRI data backing up meditative states...weak correlation at best, for now. It also reminds me of the "calorie burn" metrics put out by Polar heart rate monitors. There is no 1-to-1 correspondence between heart rate and work performed, just averages and interpolations.
-- tomo
Replied by Tom Otvos on topic Sleep Cycle App
Chris Marti wrote: I'll download it and try it.
It reminds me in a way of fMRI studies - you have to take a leap of faith that what it actually measures (movement) is a good proxy for what we'd like it to measure (sleep cycle).
/skeptical thinking
Fortunately (and I am not saying they actually did this), they could have calibrated the device using real EEG data, which is a pretty reliable indicator of sleep. Contrast that with our holy grail of fMRI data backing up meditative states...weak correlation at best, for now. It also reminds me of the "calorie burn" metrics put out by Polar heart rate monitors. There is no 1-to-1 correspondence between heart rate and work performed, just averages and interpolations.
-- tomo
12 years 5 months ago #11487
by Tom Otvos
-- tomo
Replied by Tom Otvos on topic Sleep Cycle App
The more I think about this app the more confused I am about how it works. It is equating "deep sleep" with lack of movement and yet, when you are dreaming are you not totally immobile? I recall reading that when you enter the dream state, your body releases a chemical that essentially disengages your motor functions, in order to prevent you from acting out your dreams. So this app would therefore equate "deep" with REM sleep, which doesn't seem right.
en.wikipedia.org/wiki/Non-rapid_eye_movement_sleep
www.psychologytoday.com/blog/sleepless-i...e-mystery-deep-sleep
en.wikipedia.org/wiki/Non-rapid_eye_movement_sleep
www.psychologytoday.com/blog/sleepless-i...e-mystery-deep-sleep
-- tomo
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12 years 5 months ago #11488
by Chris Marti
Replied by Chris Marti on topic Sleep Cycle App
Now that's what I'm talkin' about. It's one thing to sell software to the masses, another thing to actually be measuring the sleep cycle. Those tow things may not match up very well through an iPhone.
12 years 5 months ago #11489
by Ona Kiser
Replied by Ona Kiser on topic Sleep Cycle App
have you ever watched your spouse in dream sleep? they twitch, mumble, wriggle. (which makes me wonder about the movement suppression, which is clearly partially effective but not totally). last night i was aware of intense dreaming in the second part of the night, and the graph showed lots of up cycles (ie small movements instead of total stillness). so ymmv?
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12 years 5 months ago - 12 years 5 months ago #11490
by Chris Marti
Replied by Chris Marti on topic Sleep Cycle App
I suspect it will work best if we believe in it.
Last edit: 12 years 5 months ago by Chris Marti.
12 years 5 months ago #11493
by Tom Otvos
I really don't know, except that I have now read in several references that the body is paralyzed during REM sleep. I have also read that deep sleep is not without dreams, they are just of a different character. But what do I know?
-- tomo
Replied by Tom Otvos on topic Sleep Cycle App
Ona Kiser wrote: have you ever watched your spouse in dream sleep? they twitch, mumble, wriggle. (which makes me wonder about the movement suppression, which is clearly partially effective but not totally). last night i was aware of intense dreaming in the second part of the night, and the graph showed lots of up cycles (ie small movements instead of total stillness). so ymmv?
I really don't know, except that I have now read in several references that the body is paralyzed during REM sleep. I have also read that deep sleep is not without dreams, they are just of a different character. But what do I know?
-- tomo
12 years 5 months ago #11514
by Russell
Replied by Russell on topic Sleep Cycle App
I've finally gotten the 5 days in to calibrate this thing. It said my sleep quality was 86% last night. I have no idea what to do with this data. It's kind of fun but, I think I can be own barometer for how I slept. I will continue to try to use it as an alarm and see if it makes a difference in how I feel when I wake up, but to me this toy is losing its luster.
12 years 5 months ago #11517
by nadav
Replied by nadav on topic Sleep Cycle App
I've used this thing a bunch over the years. The sleep quality percentage thing is fairly new, and of questionable efficacy, I think. 
The alarm clock seems to work well for a few days/weeks, but after a while I'm just as likely to be groggy as without it so I stop using it.
The alarm clock seems to work well for a few days/weeks, but after a while I'm just as likely to be groggy as without it so I stop using it.
12 years 5 months ago #11519
by Ona Kiser
Replied by Ona Kiser on topic Sleep Cycle App
Nothing like over-analyzing a bit of fun... oh well.
At the least it has a super excellent alarm, because it starts quietly, it snoozes by slapping at it without opening your eyes...
I was enjoying seeing the little charts, too, that showed how much I moved around at night.
At the least it has a super excellent alarm, because it starts quietly, it snoozes by slapping at it without opening your eyes...
I was enjoying seeing the little charts, too, that showed how much I moved around at night.