~ていると (when/if you keep)

Being surrounded by the stillness of night brings a peaceful, relaxed feeling.

If you keep staying up late, it'll ruin your health, you know.

If you keep staying up late every night, you're going to ruin your health.

If you overeat every day, you'll definitely end up getting fat.

If you keep just eating out every day, you'll start to miss home cooking.