Why is it my wife Falls asleep after sex?

OK she is 29 weeks pregnant with twins and everything. And my wife can not get enough of me she has become super turned on bye my body. But for some reason after sex she just rolls over and goes to sleep. I don't get why she dose this. I mean i just want her to hold me for a little bit. I have tried talking to... show more OK she is 29 weeks pregnant with twins and everything. And my wife can not get enough of me she has become super turned on bye my body. But for some reason after sex she just rolls over and goes to sleep. I don't get why she dose this. I mean i just want her to hold me for a little bit. I have tried talking to her about it but she just says she feels super sleepy after words and just wants to sleep. Why is this? Advise?
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