I'm pup sitting and this is the third night. Every other night at 4am I've left him out and he's gone for a wee immediately.nothing tonight and I was down before 4 as I woke so waited 20 mins.. He had plenty of water yesterday but it is very warm. He cried a bit when I left so I tried again, no go. What should I do now? Try again at 5? Or just sleep now and see? Thanks to anyone who's up!!