Our 2 year old toddler has become quite attached to taking his sippy cup of milk to bed with him at bedtime.

We're concerned this will cause .. issues .. down the road with toilet training and sleeping through the night without accidents.

On the other hand, he's been coughing a lot lately and might naturally want some fluids at night, too.

Should we be strict and discourage our toddler from getting in the habit of keeping a sippy cup of milk or water with him at bedtime?