Wife fell asleep during foreplay, help?

My wife and I hv been married for three years. We have a child that is 6 months old. Shes been pretty busy with everything so the other night I got my mum to look after the baby so we could have some time to ourselves. I cooked a meal and it was all well. But we got into bed and starting kissing but she fell asleep... show more My wife and I hv been married for three years. We have a child that is 6 months old. Shes been pretty busy with everything so the other night I got my mum to look after the baby so we could have some time to ourselves. I cooked a meal and it was all well. But we got into bed and starting kissing but she fell asleep during foreplay. Is she just tired or is our sex life declining?
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