My friend falls asleep on me while on facetime and I think it's intentional, what does it mean?

Its kinda like she calls me just to go to sleep. She only wants to call me around 10pm and we talk for about 2 hours. I don't know if that's to long or what. We do this every other day.
My friend falls asleep on me while on facetime and I think it's intentional, what does it mean?
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