Had you taken any alchol, sleeping pills, Medication, or drugs before going to bed?.
Wer eyou dehydrated, over tired, stressed.
The mind and subconcious plays tricks on us, Our dream state is wel ldocumented to produce wild emotions and vivid realities that are not real.
Since your dad was already in hospital i put it to you that your mind was working over time already knowing what may or may not hapen.
Not spirit world just normal dream state in which you mind thinks through things and plays out different forms of stress reduction.
Reality and dreams are two different things?