were you on any medications while you were in the hospital? my wife was given ambien one night when she was hospitalized and she had a nightmare about her room filling up with chicken nuggets and there not being enough dipping sauce to eat them all.

The appearance of the friends could either be simply that they were in the back of your mind when you fell asleep, or some traits of theirs that you relate to are needing your attention (as anyone in your dream is actually a reflection of yourself). Same goes for your mom.