I feel terrible

I missed my youngest son's halloween party at daycare. It was an accident but i feel so bad about it. I had been awake for 24hrs and decided to take a nap but forgot to set the alarm to wake up. I immediately called the daycare but the teacher assured me that he was fine and enjoyed the party with all his friends. He's such a big boy. Him and big brother are going trick-or-treating tonight with dad cause mommy has to work =(