This ever happen to you?

[jimnsc]

I can have an excellent night going but have to get up during the night and when I look at my results, the worst ones appear 'after' I have gotten up and laid back down and resumed my treatment. Does anyone have a machine that gives them the capability to look at any part of their sleep and see what your AHI was for that period of time? Just wondering how I was doing before I had to get up.

Example: Before I get up I can have good readings with blessed few hypopneas and/or snores. Then I lay back down for maybe an hour to an hour and a half and have twice the number of hypopneas, snores, or maybe even an apnea event thrown in.

[robysue]

I can have an excellent night going but have to get up during the night and when I look at my results, the worst ones appear 'after' I have gotten up and laid back down and resumed my treatment. Does anyone have a machine that gives them the capability to look at any part of their sleep and see what your AHI was for that period of time? Just wondering how I was doing before I had to get up.

If I recall correctly, the S9 will report the "overnight AHI" within a few minutes of being turned off. Not sure if that's exactly what you're looking for or not, so let me be a little clearer.

The S9's overnight data is computed from noon Day 1 to noon Day 2. Assuming that you take no afternoon nap, the S9's on board overnight AHI computations work like this:

Let's suppose you go to bed at 11:00 pm and get up to go pee at 2:30 am and turn the machine off. When you look at the on-board AHI before returning to bed, it will reflect the AHI based on the 3.5 hours of run time between 11:00 pm and 2:30 am. So if it detected 3 apneas and hypopneas during those 3.5 hours, its on-board data will report and AHI = 3/3.5 = 0.86 = 0.8 (because the S9 truncates rather than rounds the decimal) if you look at the on-board data in the middle of the night before you turn the machine back on and go to bed. Now let's suppose you turn the S9 back on at 2:45 and sleep until your normal wake up time of 7:00. That's 4.25 more hours of "run time"---so the total run time for the night is 2.5 + 4.25 = 6.75. Let's suppose that during that second period of sleep the machine detected 10 more events. When you look at the AHI in the morning (i.e. after 7:00 and before noon), the S9's lcd will report an AHI = (3+10)/(2.5+4.25) = 13/6.75 = 1.93 = 1.9 since the S9 truncates the AHI at one decimal place.

Now if you take an afternoon nap, any apneas/hypopneas during that nap and the time the machine was running for the nap will be added into the AHI computations whenever you look at them until the following day at noon.

[gasp]

Out of curiosity, do most of your AHIs happen when you first go to sleep, which would be similar to going back to sleep after getting up?

[jimnsc]

The intent of my question was this. Say I slept from 10 pm to 7 am but got up at 5 am and then went back to bed after visiting the bathroom. A little after 7 am I can get the results for the night but was wondering if anyone had the capability to get their AHI from 10 pm until 5 am, and then from 5 am until 7 am after the fact. All I can get is from 10 to 7 including the bathroom break.

My hypopneas, until I get up to go to the bathroom, are spaced out and are few. The hypopneas post bathroom break and the apnea post bathroom break fall about the center of the last period of sleep. I am assuming I have fallen back into sleep mode when they occur.

If I never put the mask back on after going to the bathroom my AHI would have been much lower and I would be looking at results from the longest period of sleep. As it is I get results tainted by the shortest period of sleep and they cover the entire time.

How do you see it? Am I just stretching at a gnat or do I have a valid concern? Hopefully I have made myself clearer with the example.

[Pugsy]

If I have a break in therapy show on the reports it will still combine the second portion of the night after a restart in total AHI.
I don't know of any that will split the night unless maybe SleepHead will do it. For sure you can manually examine a section of time for each flagged event.

Unfortunately it won't work with your machine. I know you are curious about what is going on after that break but I don't know of anyway to see it in any detail except with SleepyHead. Any thoughts to a back up machine?...Do you want to stretch that gnat bad enough to get a different machine that shows data differently?

If you want examples of SH... I would be happy to get some for you. I can zoom in and count the duration of each event if I want to. Pretty cool.

[Otter]

Jimnsc, I don't know of any machine or software with the capability you're talking about, however, I intend to put in a feature request to calculate AHI on whatever data is highlighted in SleepyHead. Mark's go this hands full right now, though, so I'll wait until he has more of the basics in place.

It's easy enough to calculate your own AHI. With the Intellipap, you'd need to get the data module and software. Then you could see when the events occurred.
AHI = (Apneas + Hypopneas) / Hours
I sometimes do this calculation to see what my AHI was without a period when I know I was awake.

It's not too surprising that you have more events in later part of your night. For most people, sleep gets deeper as the night goes on, and getting up to pee doesn't necessarily change that. You're probably just going deeper into REM. Your throat relaxes more, so you have more events.

If you usually sleep on your side, it's also possible you wind up on your back in the morning, perhaps because your back starts to hurt. That could make a huge difference.

[jimnsc]

Thanks to each of you for your input. I probably am allowing results to dominate my thinking. Otter, you just about described me to a tee in sleep position. Oh well, if you never ask you never know. Thanks again, folks. It's always good to hear from the pros.

Jim

[gasp]

Jimnsc, I don't know of any machine or software with the capability you're talking about, however, I intend to put in a feature request to calculate AHI on whatever data is highlighted in SleepyHead. Mark's go this hands full right now, though, so I'll wait until he has more of the basics in place.

It's easy enough to calculate your own AHI. With the Intellipap, you'd need to get the data module and software. Then you could see when the events occurred.
AHI = (Apneas + Hypopneas) / Hours
I sometimes do this calculation to see what my AHI was without a period when I know I was awake.

It's not too surprising that you have more events in later part of your night. For most people, sleep gets deeper as the night goes on, and getting up to pee doesn't necessarily change that. You're probably just going deeper into REM. Your throat relaxes more, so you have more events.

If you usually sleep on your side, it's also possible you wind up on your back in the morning, perhaps because your back starts to hurt. That could make a huge difference.

Interesting . . . and is it true that REM starts 70 to 90 minutes after a person goes to sleep, no matter when that is - at the beginning of the night or after getting up in the night?

[DouglasL]

I have exactly the same issue you do. I have my most hypopneas falling asleep or falling back asleep.
You can see that in my report. Apneas have almost all but disappeared but the hypops are there.

I'm going to discuss with my sleep doc but if anyone has experience with adjusting the sensitivity for hypops that would be appreciated.

[Muse-Inc]

Typically, I have most of my events towards the morning, more if I've gotten up and gone back to sleep -- I assume this is likely REM as this is when I often have dreams whose scenes I might remember. Then, there are the nights using my borrowed S9 AutoSet with AHI=0...wahoo