Examples can be multiplied...
Let's see...
I left vault and went straight to Megaton. All NPCs with dialogues had an option: "I am looking for my father..." OK, people in rather closed community usually know each other so they would notice instantly if some stranger was passing by. But Moriarty recognizes me in a blink of an eye! I am 19, right? I was toddler back then, right? I am just asking about some middle-aged man, right? And he knows exactly who I am, who my fahter is... And I do not even wear vault suit since I did some exploring, gathered some armours and look in fact like a Raider. Hell, he doesn't even see my face because I wear Arclight raider helmet... What a mess.
Let's try another approach...
I left vault and went straight to Megaton. Good sheriff told me about some place called Rivet City. So fuck bombtown, let's go south-east! So I went to Rivet City and when platform extended I boldly went to entrance just to meet some guard who asked me what my busness might be... And one of the lines was: 'I am looking for my dad'. Holy shit! I didn't even ask about Liam Neesen in Megaton, why in the name of Jupiter some stranger, guard from the city located miles away would have such dialogue option? And this question sounds so stupidly. It's laziness because creators of the game seem to assume that PC will visit Rivet City during Main Quest, no matter what.
Similar situation is when PC discover Tranquility Lane vault not during Main Quest but while simply explorind gameworld. There is question about dad - it seems completely out of the blue if this vault is discovered by accident. It's nice that part of the MQ can be skipped that way but it's so illogical when it comes to dialogues.
As for sleeping in bed... it's better to purchase this Infirmary thingy to 'my-lovly-fallout-3's-home' - it's stupid since it's so very mighty, but somehow it seems less stupid than one hour of sleep that gives full health restoration [and an experience bonus].