Toshiba Satellite Pro won't go into sleep mode correctly

About half the time, when my computer tries to go into sleep mode when I've left it for a while, it doesn't fall asleep properly. I'm not very good with computers, but when the computer is on standby the power light at the front flashes. Well, sometimes The screen will go dark, the the power light won't flash and the NUM LOCK button is still lit up. It doesn't respond to me toggling on the mouse pad and the only thing I can do is force a shut down and reboot.
It doesn't happen all the time, but it seems to be happening a lot more often than it should be.
It happen almost constantly when I was downloading a game from steam. I had to keep the computer constantly running for it to download and couldn't leave it to sit.
If anyone has any advice, it'd be much appreciates. Especially if I can do it myself and not take it to a shop.
Thank you!

are you sure that the PC isnt going into hibernation sometimes? moving the mouse doesnt wake my laptop up either, for me its either lifting the lid or pressing the power button (all laptops are configured differently depending on manufacturers preference for these settings). Check your advanced power options and make sure the computer isnt going into hibernation first.

The problem is normally the video driver. Update your display driver by checking first if there are newer drivers cued in optional Windows Updates after enabling Automatically get recommended drivers and updates for your hardware . If not check for the latest on the Toshiba Downloads webpage for your model.

Sleep Mode Problems - Vista Forums

Gathering a Startup, Shutdown, Sleep, Hibernate, or Reboot Trace - Windows 7 Forums

It would definitely help to know the specific model of your computer as well.

My laptop is a toshiba satellite pro c850 15t.

Occasionally, the power button wakes it up, or opening the lid, but a lot of the time nothing happen at all and I have to force a shut down.

I will check out the drivers and see if that is the problem.

Thanks for the advice, any more would be appreciated. I'll leave any progress on here

If updating the drivers and working through the Troubleshooting checklist from Vista forums doesn't help, the Startup trace will always pinpoint the problem.

Press Windows+R, and enter "cmd.exe" without the quotes. Enter

Code:

powercfg -requests

into the Command Prompt, and screenshot the result.
Thanks!