Mall I don't think you should feel guilty if you go without food for 8-10 hours while you are sleeping at night. Its something that you kind of don't have any control over. Baby will get the nutrients he/she needs from your body. As long as you do eat whenever you feel hungry. Also you can keep something by your bedside & if you wake up in the middle of the night & you feel a bit hungry. Munch onto something.
Baby only needs 300 extra calories every day.
Congrats Silsila :)