Night and morning licking of feet and fingers

by Bridget
(Australia)

I have a 7 year old son who has developed a strange tendency to wear socks at night even on really hot nights. He is very reluctant to remove them so I've given in and he wears them nightly. But more recently, he's been licking his fingers and sometimes his feet because they feel 'dry'. What? Has anyone cone across this before and am I in the right place to be wondering if this is a sensory issue?

Aside from this I wouldn't say I have noticed other major concerns with my son's behavior other than a bit if an avoidance of meat. Highly processed meat is ok, but he won't eat things other than sausages, chicken nuggets etc. His diet is high in fruit and veggies and nuts and yoghurt so we cover iron and protein, but meat is always an issue if not carefully managed. He doesn't like change much but gains confidence quickly after change these days. He is bright, social and doing well at school. Does this sound like a sensory disorder or just a weird fetish?