Am I being silly?

Me and my partner have been together 5 year now and have a beautiful little 8month old boy :)
Sex is a lot to me in the relationship, and every time lately I try and seduce him or whatever he always says 'not in the mood' which is really starting to get on my nerves.. does he not feel me anymore? Is he not interested? 
I want and deserve to feel 'wanted' and loved. And he's just doesn't seem that bothered anymore. And when he does it's like 2am when I'm sleeping.. but I always give in Becuase girls have their needs to, and I want to share some chemistry with him.
Am I being stupid? 

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