However, when your child has a fall or hits her head and you do not consider it serious, you only need to keep an eye on her for a while (about 2 hours). After a serious fall or a hit to the head, it is fine for a child to sleep. In fact, a little nap may be just what she needs after a trauma.
You do have to watch your child for a couple of days for any signs of damage such as headache, vomiting, speech changes, trouble coordinating or walking.
Also, it’s recommended that you try to wake your child a couple of times during the night and check for the ability to walk and talk. If you cannot wake your child, or you see other worrisome symptoms, seek medical attention immediately.