T.C.
My kids have problems with sunscreens. My son tends to get eczema on his wrists, elbows, back of neck after sunscreen, particularly if we don't wash it off really well after he's back inside. He'll itch at night and we'll need to get out the hydrocortizone. Food allergies do the same to him. My daughter gets hives and a runny nose from sunscreen. We've had to try a lot of different kinds, none seem great, but some seem less irritating than others. We're on Clinique right now, which is too expensive. Some others that generally work are Aveeno or Neutrogena, though they both irritate at least one of my kids. But, if the itching at night is something new for your son, this could be a consideration, since it is the season for sunscreen.