Parts of the day - what are their Russian names and time boundaries?

I would like to make a list of Russian names for parts of the day. For each part of the day I want to know when exactly it starts and ends, what greetings are used, adverbs like "утром" and words for meals.

I've made a short list during my studies. I'm not sure about exact time periods. Please, correct my mistakes and help me complete the list.

• утро: 6AM - 12PM(?) /Food is завтрак (breakfast) / Greeting is Доброе утро! -//- утром
• день: 12PM - 4PM(?) /Food is обед (lunch) / Greeting is Добрый день! -//- днём
• вечер: 4PM - 10PM(?) /Food is ужин (supper) / Greeting is Добрый вечер! -//- вечером
• ночь: 10PM - 4AM(?) /No food or закуска (snack) / Greeting is Спокойной ночи! -//- ночью

Can we add "рассвет"? When is it used? What about other words in between?

Summary of responses

Word      Duration      Greeting              Meal
------------------------------------------------------------------------
утро      4AM-11AM      Доброе утро!          завтрак (breakfast)
                        С добрым утром!
------------------------------------------------------------------------
полдень   noon          Добрый день!          обед (lunch)
------------------------------------------------------------------------
день      12PM-4PM      Добрый день!          обед (lunch)
                                              полдник (afternoon snack)
------------------------------------------------------------------------
вечер     5PM-11PM      Добрый вечер!         ужин (dinner)
------------------------------------------------------------------------
полночь   midnight      (No greetings)        No food or закуска (snack)
------------------------------------------------------------------------
ночь      12AM-3AM      (No greetings)        No food or закуска (snack)
                        Спокойной ночи! = Good night!
                        Доброй ночи! = Good night!
                        Приятных снов! = Sweet dreams!