My wife fell asleep before sex?

she said she wanted to work on our sex life and then last night fell asleep before sex.. should I be upset or let it go
Update: to clarify, we were in bed and getting comfortable and then she falls asleep
Update 2: that's right, she was probably tired from watching me, do four loads of laundry, clean the house, give bath to child and cook dinner, or maybe she was tired from reading the newspaper
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