Computer Goes Into Sleep Mode By Itself

Experiencing a weird phenomenon this morning... my PowerBook is sending itself into sleep mode. The battery is charged and it's not overheated. It does it when plugged in and when unplugged.
When I hit the 'power' button to wake it up, it always comes back on, but then shuts off 10-30 seconds later. It's now been on without sleeping for ten minutes or so, but would still like to know what's causing this very un-Mac-like behavior and how to fix it.
Thanks,
Matthew
PowerBook G4 15" Mac OS X (10.3.9) 100G Hard Drive

Back to the beginning, then. Are you certain the Powerbook is actually sleeping? Is the sleep light pulsing? If not, the problem is that your backlight is going off, not that the PB is going to sleep. That would most likely indicate a bad inverter board. When the backlight goes off, shine a bright light on the screen, or shine a bright light through the Apple logo from the back side of the display. Can you see the screen image that way? If so, replacing your inverter will probably solve the problem — and if the inverter is failing, nothing else will.
EDIT: BTW, I meant to mention this earlier but forgot. In your original post you implied that you habitually hit the Power button to wake the computer from sleep. That's probably not a great idea, since there's a small risk that you'll accidentally shut it down that way if you aren't really paying attention. I always wake mine using a Shift key, which carries no risk at all of causing anything odd to happen — not even of typing a stray character into an open document, or moving the cursor from where I left it.

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Attachments:
PowerHibernateNever.jpg ‏59 KB

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Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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Hi. I'm not sure where to post this so I'll try it here.
My laptop shut downs automatically when it goes into sleep mode. Not right away when going into sleep mode. Maybe like an hour later after going into sleep mode.
I'm not sure it's overheating because it never shuts down while I'm actually using the laptop.
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Product name and number: HP ENVY TouchSmart Sleekbook 4-1115dx
Operating System: Window 8
Error Message: None
Any changes to your system before problem occurred: No

Hey Tecmo_SB_Guy,
I would suggest you take a look at advanced power settings. It can seem like the notebook is turning off when it is actually just hibernating. You can set it to not hibernate.
1. Windows key + Q to open the Search Bar
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5. In Power Options, Click Change when the computer sleeps, on the left.
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9. Click Apply to save changes.
If you don't already shut it down periodically, I would suggest shutting it down at least 2-3 times a week if you use it daily. Leaving the computer running continuously can shorten its lifespan. Hard drive failures and motherboard issues are seen much more often on machines that are left running constantly. Computers get bogged down and run slowly when the memory is full. Memory only clears out and resets itself when the computer is shut down. Here is a link explaining more about memory accumulation and hardware aging.
I hope these suggestions help! Please let me know if you have any questions
Attachments:
PowerHibernateNever.jpg ‏59 KB

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I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
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