Too tired

Don't you just love when you are so tired and you lay down to go to sleep and then you can't sleep for like the next 4 hours....why does this happen? Shouldn't you just fall right to sleep...I mean really, I worked hard today, I cooked, I cleaned, I ran errands, I played with my children, I worked on the computer and everything and now when I should be sleeping I can't fall asleep...so I gave up and now I am going to try again....I just want to sleep for like a year....no interupptions, no little feet in the small of my back from little bed hogs... no snoring husband...he can be sleeping just not snoring:)