If your child is clearly ill, then you can take necessary steps to diagnose the problem, give medicine or, if serious, take further action. But you absolutely must not be sympathetic, coddling, re-assuring, cuddle, etc... Between 10pm and 6am it has to be all business! A matter-of-fact, un-emotional, less-is-more communication style.
Why is this so important? Why is it so wrong to show the child how much you love them? May be just a little cuddle?
NO! NO! NO!
Toddlers don't get up in the night because they're scared, because they're cold, because they're poorly. They get up because they like being with you. And if they are feeling scared, cold or poorly, this just amplifies the feeling.
Wow there is so much wrong with that blog that DaddyDaddyCool linked to, but the above bit particularly jumped out at me. So, kids don't actually get scared or cold or poorly, right? They are just manipulative & attention seeking? Big shocker - at the baby & toddler stage it's normal to want attention, that's how children learn their value & learn to be confident. We always comforted our DD in the night, she's a great sleeper, she didn't even wake for the fireworks.