I also sleep like shit. 3-5 hrs for weeks on end.
I have about 3 hrs of work to do today. Normally I'd wait till everyone is in bed, work on it till 3am, then 'sleep in' till 7 so I could be ready for work.
Now I'm just doing it midday so i can go to bed at a normal time.
(Actually i'm procrastinating currently, another bad habit that i've developed by telling myself i can just do the work when everyone goes to bed).
Also, I am big on the "5-minute rule". I promise to do at least 5 minutes of a task. Again, this works like crazy.
Doing regular physical exercise helps a bit, and so does playing challenging PC games instead of just passively vegging out on ${streamingProvider} for downtime (*if any).
In addition to the Emfit, I use a pulse oximeter, and you can download all the data over USB. No cloud.
It's actually a medical device, which means the software is horrible. I'm running Windows inside a VirtualBox VM on my Mac to extract data and plots from it.
It has a finger sensor that you wear all night. It measures your heart rate and SpO2 (oxygen levels, roughly). That's it. The Emfit is nice because it also tells you when you get out of bed, measures REM sleep vs. light sleep, etc.
The pulse oximeter is useful for keeping track of sleep apnea, but I was suggesting a more general consumer device to get a picture of how you sleep first. (Most people probably don't want to wear something on their finger every single night if there's no symptoms.)
Sleep apnea is incredibly common. Snoring a big indicator for it. It means you aren't breathing properly at night, which means you can't sleep properly. Brain fog is a common symptom (although personally this isn't my issue). It ranges from minor/undiagnosed to severe/life-threatening, and it's chronic so it gets worse as you get older.
But I'm sure there are other sleep disorders that can cause brain fog.
So I actually use 2 different devices -- one cloud and one not -- and they give different information.
https://www.amazon.com/CONTEC-CMS50F-oximeter-monitor-softwa...
I am not certain of the technical measuees safeguarding thus, mind you.
For tracking, I use autosleep. They say the data doesn’t leave the device. The data is done through apple health, so there might be a safeguard apple enforces which means it is not possible for the data to leave the device, but can be used by an app.
http://autosleep.tantsissa.com/privacy
This indicates that apple enforces a prohibition against health data export. https://stackoverflow.com/questions/32622306/can-i-store-hea...
I know people who are using FitBit track their sleep. I've never used it; instead I got the sleep tracker that was mentioned in a recent blog post here:
https://www.amazon.com/Emfit-QS/dp/B0158W3E2A
They're not medical devices, but if you're mystified as to what's going on, it might help to figure out if problems correlate with poor sleep.
(I don't know anything about statins, but if you want another place to look...)
EDIT: I saw in your other comment that you're working 70 hour weeks -- personally that is the first thing I would address. You don't have enough time to pay attention to your health, which is false economy!