Preheat the oven to 375°F. Line a baking sheet with parchment paper.
Remove the sausages from the package and dry them thoroughly with a paper towel.
Unwrap the crescent rolls and seal together the perforations. Using a sharp knife or pizza wheel, cut the crescent rolls into 3-inch strips (cut enough to match the number of sausages).
Wrap each strip of dough around the center of each sausage, pinching the ends to seal it shut. Arrange the prepared sausages on the baking sheet, spacing them at least 2 inches apart.
Whisk the egg with 1 tablespoon water then brush the tops of the crescent rolls. Sprinkle with sea salt or Everything seasoning (optional) then bake until golden brown, 12 to 15 minutes.
Remove from the oven and let cool slightly before serving.