How do I get a girl to willingly fall asleep in my arms? Or to willingly hold me in her arms until I fall asleep?

I find the act of falling asleep in someone's arms to be utterly sweet, cozy and caring. And just to be clear, I am considering both female friends and potential partners (currently single) as people who could fall asleep in my arms, or I fall asleep in theirs.

How do I get a girl to willingly fall asleep in my arms? Or to willingly hold me in her arms until I fall asleep?
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