My Husband wants sex every night...

We've been married for 4 yrs. We have a 2 yr old kid.
Every single night, my husband is pestering me to spread my legs. I really and truly don't feel like having sex every night.
I work all day, as does he, and after working all day, I come home and cook dinner, chase around my 2 yr old until he goes to bed.
When we go to bed around 10 pm or later, I'm tired. Some days, sure by all means, I'm okay to have sex. Other times, I want to rest (I think it but don't say it). I've done "other" things to help him out but sometimes I just want to sleep. Why don't men just want to sleep??
I mean, I enjoy it sometimes, but I'm really tired some days, so how can I persuade him that we should cut back to a few times a week so I can relax sometimes.
So , is this normal to want sex daily? Am I expected to give him what he wants daily?
Do other married couples, with children, have sex daily??
Is it important for mens to get release everyday.Cant they sleep without it?