Having trouble downloading SleepyHead Software

Is the Sleepyhead software a PDF reader? WHen trying to download, it tries to install unrelated software

No.
Where are you trying to download SleepyHead from?
Get it from here. That's where I get it from. Nothing at this link to accidentally click on some other product.
https://sleepyhead.jedimark.net/

Hijacking the thread to ask if JediMark is still developing SleepyHead, or is it "orphanware"?

Recent posts indicate he is working on it again.

dvejr wrote: ↑

Sun Jul 08, 2018 6:00 pm

Hijacking the thread to ask if JediMark is still developing SleepyHead, or is it "orphanware"?

Jedimark is still developing it.
The following comments are my personal view of the current situation.

Jedimark started work on a debug release to be 1.1. I think he got so frustrated dealing with his old errors that he had “gone underground “ working on a major rewrite. My understanding is that currently he is not working outside the home so he has been working on Sleepyhead.

A major issue impeding development was the dependency on WebKit. He removed that with the newer version.

He posted a link to some static test builds on the Sleepyhead Facebook page.

Thank you. I don't allow the FaceBook software on any of my devices, but that doesn't make your post any less useful to me. .

dvejr wrote: ↑

Sun Jul 08, 2018 6:31 pm

Thank you. I don't use allow the FaceBook software on any of my devices, but that doesn't make your post any less useful to me. .

I do not blame you. You can view the page here (June 13 post) without an account.

https://www.facebook.com/groups/sleepyheadcpap/