Your commands will be more persuasive if you lean in to your right and speak into her left ear.

From wikipedia on persuasion:

One way therefore to increase persuasion would seem to be to selectively activate the right prefrontal cortex. This is easily done by monaural stimulation to the contralateral ear. The effect apparently depends on selective attention rather than merely the source of stimulation. This manipulation had the expected outcome: more persuasion for messages coming from the left.[8]

You may consider sleeping to her left as well.