Had the same problem, can't do nothing about it unfortunately. Either block the light with a sticker or do shut down instead of sleep. From my understanding the light blinks so the user will know the pc is still on.
Is there seriously no way of turning off my power button blinking your chosen color when in sleep mode? I have tried the go dark trick in AWCC before putting the PC into sleep mode but the power light comes back on and blinks when I go into sleep mode. I do not want a debate on whether I should be using sleep  mode or shutting down as that just diverts attention away from my complaint. Have Dell made it so you can not stop the power light blinking? If so, for what good reason? Thank you.
Aurora R13, power light blinking during sleep