I know this is probably weird, but not uncommon. Although a bit from the tribes era, I know it's one of those things someone in love may easily understand - a smell of your loved ones is something you can carry throughout your live.
So, when there's sleeping time, and cuddling time, I just love that moment when I can experience scents of tiredness, milk (that's the younger one), sand (that's the older one, the younger one is slowly getting there, though), wind and sun. The smell of food and fun. The best ever;)