My toddling ten month old fell from sofa surfing today, landed on knees and forarms but forehead also hit wooden floor. Red mark that is only very slightly raised and cried for less than a minute and was easily distracted by cuddles and toys. That was at 8am. Went down nicely for 9.30 nap and is still asleep 2hours and 10 minutes later which is longer than normal. Should I be concerned?