Sleep mode option disappearing from Start Menu

Hello,

I have an issue where my Sleep mode button is disappearing from the Start Menu whenever I unplug from the AC
power supply and go on battery. See screenshot below. On the left is when I'm AC power and the right is on battery power. See how the Sleep mode button disappears? I would like to prevent this from happening. I've checked everywhere in my Power Options for some sort of setting. I'm using the High Performance setting with all the defaults. My computer is a Toshiba Portege Z30-C laptop running Windows 10 64-bit.

Any help would be very appreciated. Thank you.

Perhaps check this is not set:

If you look at the settings for sleep in Settings it will say a qualifier "when Plugged in" my PC is always plugged in and sleep still does not work.