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DreamStalker, if you're watching with another name, here's a follow on that does show the seasons. Here I 've charted my Total Sleep (Z), a 7 day rolling average of Z, and the trend of Z compared to the seasons (hours of Sun), with markers for start and stop of daylight savings time as well as the moon at full. What I see is my sleep is cyclical with a frequency of about twice that of the seasons, that could be influenced by the seasons as well as by daylight savings time, but if there is a correlation, it is not clear. The one positive that this chart shows it that my sleep has increased from a little less than 6 hours per night to a little more than 7 over the past 3 years.
also see: Charting for Geeks

Temp and barometric pressure go together. My wife mas MS. on their forum there is a large correlation between pressure changes and how hey feel. My Wife's attitude is a great weather forecaster.

I bet if you remapped from Temp to pressure (and try delta pressure i.e pressure change from one day to the next) you would find a relationship...... just a guess...

Could this be it:
1) Cooling temperatures typically mean higher ambient atmospheric pressure.
2) Since a CPAP provides pressure support of a set amount of cm H20 pressure, the overall absolute pressure on your airway increases.
3) That leads to less apnea events and less precursor events.
4) Leads to better sleep.
5) Leads to more deep sleep.

On any location on earth, the ambient atmospheric pressure varies by much more than 20cm H20 every year. Since 20 is the limit of most XPAP machines, this variation may be significant.

Just my 2cents.

I think it is related to the length of the day ... warm temp is usually in summer when the day is longer .

Guest1 wrote:Could this be it:
1) Cooling temperatures typically mean higher ambient atmospheric pressure.
2) Since a CPAP provides pressure support of a set amount of cm H20 pressure, the overall absolute pressure on your airway increases.
3) That leads to less apnea events and less precursor events.
4) Leads to better sleep.
5) Leads to more deep sleep.

On any location on earth, the ambient atmospheric pressure varies by much more than 20cm H20 every year. Since 20 is the limit of most XPAP machines, this variation may be significant.

Just my 2cents.

Your 2 cents is over priced, as xpap pressure is pressure over barometric pressure. Jim

I sleep allways with AC on 23 Degrees Celsius, and when somebody turns it off I wake up immediately
When I feel ambient air is hot -it is difficult for me to fall asleep
Did you check also correlation to ambient humidity and temperature?
Did anybody use cool humidifier with good results ?

Thanks for your replies and observations.
So, I've cleaned this up a bit. Took out the moon and and averaged sleep over 14 days rather than the 7 above.
To me, it looks as if my sleep is a little better in winter than summer, with some fairly consistent upticks just after the change to DST each March.

Sleep is measured in 30 second epochs on the left Y axis, 700 equals 350 minutes, or 5 Hrs and 50 minutes.

Is it safe to assume the evenings you work on that chart, your sleep quality declines?

DeadlySleep wrote:Is it safe to assume the evenings you work on that chart, your sleep quality declines?

Hah! That probably would be a safe assumption, except it's my day job! (Doesn't pay a lot, though)

Well, its about quitting time, so here's today's that shows some correlation with temperature.

On left Y axis, temperature is ten times the reported daily average, Sleep is in 30 sec epochs, both are 14 day rolling averages. Sun hours on right Y.