Feeding nasogastric tubes into the oesophagus can in some sedated or comatose patient’s be surprisingly hard or even impossible. One method I found works almost every time is reaching deep into the intubated patient´s mouth with two fingers.
That way you can feel the NG-tube entering the nasopharynx on the top of your fingertips. Then, using your fingers, you can often guide the NG-tube into the oesophagus. Instead of it just curling up in the patient’s mouth.